Another Stealther looking for help

[ZeroRaven]

I recently became a stealther because, quite frankly, all the fps games i've played in the past weren't enough to prepare me for real life opponents. At the moment, i have the following certs:

Engineering
Air Calvary ( or whichever gives you the reaver and skeeter)
Infil suit

I'm currently using the surge implant. I was using the melee booster, but i'm giving them all a try (from advice i've seen in other forms).

I know that i can be doing more and there are certs or implants i SHOULD be using, i just don't know which ones. Any help would be appreciated. I'm not sure what kind of player i'm looking to be in terms of support or killing, i'm just after the most exp.