Resident Evil 5 PS3 Cover

Resident Evil 5 PS3 Cover
Can you answer these questions regarding Resident Evil 5?

1. Will I be able to upgrade guns (I’m on Chapter 1-3 and I haven’t recieved that option yet)
2. Will I be able to hold more weapons in my inventory? (PS: the new inventory system is horrible.)
3. How do I use cover? (PS3 version)

Yes
No
Can only be done at certain times.