It sounds like you did it right. Actually, you can't really go wrong as long as you have the right number of stitches.
When you're finished knitting, you'll probably have to graft that edge to another edge using the kitchener stitch. Using a crochet chain to cast on enables you to just "rip" the chain out leaving the live stitches ready to be grafted.
And for future reference, I find it easier to make the chain longer than needed. That way you'll never run out of chains and have to start over. Just stop when you've picked up the required amount of stitches.