Target: Good boundaries!
If you want to get a little experience under your belt, browsing online classifieds (such as Craigslist, Mandy, etc.) can help you find productions in your area that are crewing or casting. Usually, they pay little or nothing, but if you’re just starting to learn, this sort of experience can be invaluable.
One in general might find it advantageous to not take advantage of any crew, regardless of pay status — doing so makes it harder to keep good crew around. Eventually, you wind up with a crew of people who have crappy boundaries.
And who needs that?!