Great!  Now don't act like a noob in the other parts of the forum.

I don't see it replacing gold/currency.  If anything, it will just have its place in the market in the future.

In my experience, yeah.  I get the best mining with my 7870 using 1260/750 for bitcoin and 885/1250 for litecoin.  There's a lot of information out there, search around!

A site like coinmama is grossly overpriced.  Unfortunately with Paypal, because of the chargeback possibility, it is difficult.  I ended up finding someone I could trust when I sold to them.  Otherwise, I've just used coinbase with a bank account.