Are you having trouble figuring out how to start crocheting into your knitting, or actually doing the stitch? Or both?
Here's how to do a single crochet. If you need the diagrams explained, just ask.
To crochet into your knitting, I would advise you to just crochet into every stitch. I'm fairly certain that in knitting when you BO the edge looks pretty similar to what crochet edges look like, so it shouldn't be too hard to figure out. Oh, and when you bind off - Don't pull through on that last loop, or undo it if you already have. You can just put your hook through that loop and start to crochet your border.