In order to get ammo for all weapons, you type "gunsgunsguns" without the exclamation marks. You type this in-game, so make sure your player is not standing close to an edge or something similar, seeing as how the 's' button is used to walk backwards.
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Left Trigger, Right Trigger, X, Right Trigger, Left(D-pad), Black, Right Trigger, Left(D-pad), X, Down(D-pad), Left Trigger, Left Trigger
Black is the Right Bumper and White is the Left Bumper (white isn't in the cheat but the website doesn't state which is which).
No but when you get 100% completion you can go as high as you want but youll have to buy it at the gun store or cheat 482 555 0100