Most markers around that price usually have fairly awful barrels on them, a nice new barrel should help the guns accuracy, also are you running it on air or CO2?
Best thing to do is just take the marker to a game, play along and make a mental note of things that are wrong, was the accuracy crap? Buy a new barrel or upgrade to air. Did the hopper keep moving about while playing? Buy a clamping feedneck. There must be a million different set-ups for paintball gear and you have to buy gear to suit you. You will find everyone has an opinion on what gear they consider to be good your best bet as a new player is to have a very good read of sites like
www.pbreview.com
Probably the most important thing you can do for your new marker is to learn as much about it as you can, strip it down and rebuild it a couple times so you know how everything works. Make sure you keep it well maintained. The first thing I would buy for any first marker would be plenty of spare O-rings (you will destroy quite a few running CO2 in cold weather) and some gun oil and lubricant. Keep your marker happy and it will keep you happy.
Good luck with your new marker hope you kick ass at your next game
