Question about paper wallet to exchange

so i got a couple Question i'm going to be making my first wallet wanted to add about $500 so i decided to make a paper wallet using bitaddress.org

1) if i set up a encrypted B something with a password not sure why i'm setting a password to like how would he be able to not use my key without knowing my password sorry not sure how to ask this question but hopefully someone knows?

2) was thinking to making a blockchain.info with 2fa just because I buy small things like tools etc and some except btc so i wanted to add and wanted to know if i should put my paper wallet import and use it with blockchain.info.

3) this is just a question about whats sounds smarter to get in obviously the smaller amount but what do you think should be more likely of hitting 4600 or 5600 are my prices im thinking about getting in.

THANKS GUYS