What shoes did you get?
Sometimes its good to get cheap clipless pedals in case you don't get on with them, like me! I use mine occasionally, but still stick with flatties for the rough stuff. If its your first time, bear in mind you WILL fall over at some point, I don't know anyone who didn't. Just try not to do it at some traffic lights! If you back the tension right off, its usually possible to pull your foot right out vertically, as you would instinctivly try to do if you are about to go over
Good luck