If you want to be serious about it, you will need an AEG. Stick with Tokyo Marui (TM) for that as they are reliable and a great first gun. Just pick a model you like the look of the best as they will all fire about the same FPS and accuracy stock out of the box. You can find and military surplus store for gear. Expect to spend atleast $400 to be in the game. Springers are fun to plink around with though. I have a pair of good ones me and my neighboor have messed around with

They are pretty accurate out to 30 or 40 yards (within a foot) then after that you are guessing where the BB will go because the hopup wears off. Just dont be stupid and play in the streets where people can see you.