I want to be a skater[ule]

Skating's rad. Longboarding is sweet. Rollerblading is tiiiiight, yo.

Just get the protectors and you'll be fine. Elbows, knees, helmet, wrist guard, and (depending on your age, if you're older than 12 you'll want) ankle reinforcement. If you really want to go all out, hip, back, and tailbone pads are cheap and still not constricting. Are you going to look goofy? Sure. Is everybody else just as goofy? They're wearing clothes, aren't they? Of course they're goofy. Just make sure the helmet covers the parts of the head that are going to get hit, not just the top.