Best thing to do is just get out and fly. I assume you know the FAA VFR restrictions (check out the AIM off the FAA website if you don't). Follow those requirements and you won't have any problems. Remember that you are responsible for aircraft separation unless using flight following (only available if the ARTCC/departure is staffed). Use the UNICOM (122.8) to announce takeoff/landing/taxiing. The VATSIM forums has a tutorial/guidelines IIRC.