Death and Taxes does a swell job of listing the benefits of a credit union membership, but you should make sure to educate yourself on the drawbacks and full reality.
Additional Resources
-The Motley Fool presents a pretty clear and level outline on credit union basics.
-You should also know that some credit unions are not-for-profit (as opposed to "non-profit").
-You'll still have to pay off debts (incl. interest), pay taxes, get a job... blahblahblah.
Hopefully, this bit might start you off on figuring out whether credit unions are for you.
Credit unions: Go or no-go?