Lots of videos right on this site, showing both english & continental. Don't worry about what they're showing so much, just watch how they're holding the needles.
http://www.knittinghelp.com/videos/knitting-tips
As far as using a circular needle, you can knit back & forth like 2 straight needles if you want, don't have to start out with something in the round if you're not ready.
Good luck!