what some of you are thinking of is probably something like mmorpgfps like uh borderland(?) you pick a class, do quests, level up, get better weapons and stuff and it's all done in first person
anyway Slayer is right, save up your cash as much as possible, the guns you get at higher levels cost more and more, but it's still a good idea to buy at least on weapon, maybe the AK74 of M4A1, whichever you like
also, i hate most of the snipers in this, the semi auto snipers are WAY overpowered