Juan makes a good point. Also, they give money based on your status, for example, if you subscribe to their pro or elite pro programs, you can possibly get more for your buck. You can always check on their website, a rough estimate of what you can get for certain games. Edit: for second question. You can try doing so online, or visit your local store. I believe the base pro edition costs like 15 a year, while the other one, Elite pro, I'm not too sure.
Yes, but think careful if you would rather get the cash or in store credit. Sometimes its better to get in store credit for a future purchase
Iza you get a card when you sign up at your local gamestop wiith credit towards games you buy or trade, which can be used for discount off and item or game in store
How do I subscribe to the pro or elite pro think
Yes
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