if you are planning to jump and do stunts, stuff like that, and you haven't before...the first thing i would suggest is to purchase some pads...elbow/knee/shin....and maybe a full face helmet. chest protectors are a little over board for freeride, but if your confidence is lacking, then go ahead with the chest protector. i would start out with small stuff, and get good at that, then slowly progress to larger stunts. if you have been riding for a long time, the transition from your previous riding to freeriding should be fairly smooth.
Moving on to the bike, if not already, you might want to think about switching some parts out. Maybe beefier wheels, better fork, dual ring chain guide, or single ring if you want. if anything a bash guard to replace the top ring. make sure you cover any weak parts of your bike before beating on it too much. that should be it.