Check out this little paradiddle exercise...it's great for a warm up...doesn't have to be played fast ...great for hand coordination.
Pattern is: RLRR -L R- LRLL R L- RLRRLRLL-R L R R- LRLL - R L- RLRR -L R - LRLLRLRR - L R L L
Try this for a while before you hop on your drum set!