hey i need a little help setting up a wireless network

ive set up wired networks befor but never a wireless network

what is the difference between a wireless router and an acess point

from what i can tell if you want to have the internet conection be on more then one of the computers i would need a router

if i want to hook up 7 computers is all i would need is a wireless router and 7 wireless cards snd then set it up the same way as a wired network software wise or do i need any other hardware will 1 router be able to hold all 7 computers without any aditional hardware
thanks