Scratch

I am making a multiple room shooting game and need ideas, help, and programing help.

Here are a some things I will have:
A campaign
A survival of the fittest mode (think cod zombies)
Co-op Campaign
Co-op survival
All-for-themselves Multiplayer
TDM Multiplayer
Frags grenades
flash grenades
smoke grenades
gas grenades
infinite sprites engine for bullets
chat for muliplyer
difficulty
pistol
famas
ak74u
ak47
attachments
My intro
Combat shotgun
minigun
health
armor
revolver
Snipers rifle x2 (don't know what to call them)
scope increase accuracy

Stuff I need help doing:
Enemies being able to move in a scrolling area (adds scrolling instead of multiple room)
all multiplayer stuff
campaign design
level design
key mapping
Gun ideas
Names for sniper rifles

After the my intro, all that help me will have a little while of there name on the credits cut scene.
The point of view is side-scrolling, but the game won't scroll unless I get help.
There is a possibility that the game will end up more than 10 mb, and if it does then I will post a download link.
The game will appear as a small demo (1-3 rooms) and will only have survival game mode with perfected zombies.

Quick control message:
click - shoot
w - jump
a - move left
d - move right
e - switch grenades
1 - switch guns
r - reload
f - melee
q - throw grenade
x - use

Ok, hope to get some help on this massive project.