LankeOnLuck

I would replace Angel's Mercy with Heroes' Reunion

Huh, never realised that. Neat little combo, if you're almost losing and almost have all those cards, you could always try and go for that combo.

Paraselene would kill this rather quickly

This looks like fun, not so much if you don't start with a glimpse of nature on hand though. Guess you just gotta mulligan until you get one, or just lose. Either way, it's either you losing very early on without either you or your opponent having any fun at all or you just rick rolling your opponent as soon as the turn passes to you.
Would not recommend anyone to try one of these turn 1 insta-win decks. They're just fun the first 3 or 4 times you play them. After that, they really start to suck.

genesis wave would be killer in this 80 card deck. Given that he actually gets good mana ramp creatures on hand early game, which can be kinda hard when the deck has so many cards in it.

No problem, and if this deck does good against the friends you're playing with, I'm sure it'll survive a FNM :)

Your deck's not bad, just saying that I'm just worried about how good the other people's decks might be

That soley depends on the people you're playing with. If it's your above-average decks, I would say you could win a couple of games, though don't expect too many. You do have a limit in the cards you can use drawing cards from boosters, maybe not being able to afford those extremely good cards, don't know much about you, really). Overall, I think the deck looks pretty decent. Some cards might be a bit hard to get to (like army of the damned, that takes a lot of time to build up to).

Short answer: yes, you'd win some games but might not win more than 50% given that the players you play with do not have tournament decks and only a bit above average decks. All decks can win if played correctly, this one can.

Also, as a sidenote, learning how to build decks takes a lot more than doing anything a guys tells you to do, so if somebody tells you "take that out of the deck" don't do it immediately, it's way more important for newer players to experiment and try out the decks they build. After all, if you no longer like a specific card in a deck you have, you can just take it out and try out a new one, right?
Just noting this here, doesn't have anything to do with anything I've said earlier, just hit me now that you're new to deckbuilding, so just giving my usual advice for beginners :P

Point taken, though to make the rooftop storm even better, you could add this:
http://www.mtgvault.com/card/harvester-of-souls/AVR/
yes, whenever something dies, you can chose to draw a card. Attack with all your zombies in play (possibly get some back from the graveyard with the lich as you mentioned) and if a zombie dies, you bring it back + you get to draw a card that may very well be played for free!
On top of that, it is a big creature that kills anything that it deals damage to no matter what. Not a zombie, no, but powerful in this deck. If they do kill him, you still have ways to get him back ;)

I think you have plenty enough one drops, it's just that he found it kinda odd that you only had 1 slitherhead. Besides, you have enough cards to play early on, so it shouldn't be a problem.

the psychic strike would work, you can mill the enemies for 2 cards aswell, so something might drop to their graveyard that the Grimoire could fetch to play once you've gotten to the point of activating it.
Also, a thing I forgot to mention, the rooftop storms might not work that well in this deck. The reasons being that at the point you can cast it, you usually don't have any more cards left in hand to cast. You will also have enough mana to always be able to cast anything that you might draw
If I were you, I would remove the rooftop storms to get more of the kinds of cards you already have in your deck, like increasing the number of Blood Scriviners for example. Or maybe getting some ghoulraiser, up to you.

P.s. The Dimir Charm would work very well if you usually go up against people who uses sorceries, low power creatures (like mages, they usually do a really good effect and never attacks/blocks) alternatively, it can always be used to get more creatures into their graveyard or just make them draw a bad card next turn. If they're not getting any lands you could just remove any lands that they would have drawn on their next turn, or if they have too many lands you just remove the things that they could have casted :)

I would remove the Dissipate and get another counterspell that costs 1 less blue mana. Doing this would allow you to get more swamps instead of islands, which would increase your chance on drawing better lands in the beginning (for example, you have a lot of black cards right now and about 50% chance to get an island or a swamp. So you could end up with more islands than you'd need all game. At the same time though, you wouldn't want to end up with not having enough islands for dissipate if you happen to end up with it at the start. So the easiest solution is to switch it out, since it's just a single kind of card and making sure you can play the rest is more important.)
up to you though.

Got kinda confused by the name, thought this was a horde deck when I read it

That seems pretty nice actually. Going to see if I can't build a Horde deck myself :P My friends and I are about to buy a commander deck each too, so we'll be able to play this soon.

What even IS this? :D

The Akroma feels like it would hurt me much more than it would hurt my enemy. And yes, wrath of god is kind of expensive if I'm going to have 3 of them. (the people I play with doesn't use any regenerate effects in their decks anyways, so it wouldn't really matter right now)

the geist is expensive, the sigil fits pretty nicely and isn't all that expensive. I do have quite a lot of enchantments, too. It's not like I'm going to be dying early game anyways either.
Thanks for the tips! :)

why Nourish and not Heroe's Reunion? It gives 1 more hp in exchange for being GW and not GG

Try out Reality Strobe, with Paradox Haze, it can become a pretty good threat.