there is no 'best' drill for an attackman. When i started about two years ago, i had never picked up a stick before. But with alot of practice i got good. What i did was, get up in the morning, go for a run, come home, fill up about 3 bottles of water (for drinking), bring a few empty milk jugs out to a wall and aim on them for hours. Also try shooting on the run with all different shots. Good luck with the training and if you have questions dont be affraid to pm
-hoplax