i want to say troll, partly because of all the LOLing goin on up there. but in the case that you are serious...

did the guy at the bike shop really tell you to try the strapless thing? strapless is for bras, not bikes. and maybe bros. anyway, put them on. if you're going to be trying all these tricks and such this early on, i hope you wear a helmet. if not, get one when you get your straps. don't skid everytime you need to slow down, pay attention to whats ahead of you and resist, most of the time this will be fine. if you really want to do tricks right away, work on trackstands, they are actually useful to riding, unlike a 180 skid to pedal backwards.

don't get me wrong, tricks can be fun but riding is more fun and there is always something about your riding that you can improve. have fun.

edit: i wish i could do a backwards circle. i'm getting there.