take off your pad pack and play with just a loader full. focus on movement and communication. when you do get further up the field you have to be able to play tight enough and snap well enough to win gun battles, you'll learn quickly.
i would suggest playing a game with a pump before going out and buying one. that being said, if you do want to buy one i suggest an old sniper (autococker with a pump kit) anything with a centre feed, clamping feedneck, high quality pump kit (CCM preffered by me) and you're pretty much good to go! another thing is that unlike other markers pumps tend to hold onto their re-sale value extremely well, because companies don't really make them anymore theres no factor driving the prices down. so if you buy one then decide a while later its not for you, you'll most likely get a 100% return on your investment.