Here's a thread which might help. If you're new to rollers, you will find using regular sneakers and no straps easier (and safer) to start with. Once you get your balance and get used to the feel, clipless is actually easier and safer (quicker to release) than toe-clips and straps. Just remember to relax the upper body, and that on rollers the steering is very sensitive and so requires a very light touch.

Good Luck!

- Wil