How do I go about getting my first credit card, and what are some of best incentives I should look for?

I'm 25, have good credit anyways from loans, and financing purchases, but haven't hard a card yet.

Get one that makes you pay in full every month (like American Express.) And use it only if you can pay it off every month. Otherwise it is a black hole that will suck your financial house dry. You absolutely must set limits for yourself. People get in $30,000 to $100,000 without even noticing. And don't fall for the transfer for 0% scheme. The first time you are 1 day late the rates go to the maximum (over 25%).When you buy on credit you pay more for what you are buying. Why pay more?
To establish good credit have no more than 2 credit accounts, never ever be late with a payment, and pay off as soon as possible (not the minimum payment–you'll be a slave to it for the rest of your life). If you do that it makes sense to have credit so you have a good credit rating for big purchases like a car or house that you cannot pay in cash. But the less you spend on credit the more you have to spend without all the interest–or better yet, talk to a financial counsellor or just save in an interest free retirement or investment account. No matter what your age.