Hey Platano. I'm new too but Welcome anyway.
I just wanted to comment on your first gun buy. If your set on it then disreguard this but as a general rule (in real life as well as airsoft) the only reason anyone uses a pistol is because they don't have a rifle. I've played pistol Vs AEG and maybe you're better than I am, but I didn't last very long. I was out ranged, under FPS, and my semi-auto pistol was nothing compared to the hail of rounds the AEGs were spitting out. So I'd advise getting an AEG first.
On the off chance you already spent the money, there are roles you can still fill as a pistol-only player. CQB would be ideal and you could always play the role of a downed pilot (that's what I was designated when I played pistol only.)
Anyway, welcome again, and good shooting.