Can you ride switch proficiently? I'm going to assume no, so that's what you need to work on. After that, maybe some nose and tail butters, 50-50 grinds both regular and switch, some 180's on flatland regular and switch. If you want to start hitting some jumps, start off small, and really work on getting a grab and not just flying through the air, it will help you keep your composure in the air and pay off big later. And if your not already doing so, get a helmet.