I'd say the most important tip is to read the manual so you know how to maintain the marker. Once you know the basic maintenance routines you should have no problems keeping this thing ripping. They really are amazing.
Depending on your preference you might want to look into getting a Violent Products trigger. It has more of a scythe design and helps when playing in semi. Make sure you set up your trigger when you get it.
Other than that I can't think of anything. Have fun!