You'd be better off just going to YouTube mate, there's a plethora of build guides, ideas and DZ tips and tricks. There's so much that could be said it would take an age to write it down, it's also a case of horses for courses. What suits one person may not suit another, there's no one solution that fits all, there is try it and see only :P
Assuming you're not good at PvP, i can share what i'm using.
For weapons i'm using the "Lady death" exotic SMG and the "white death" marksman rifle with the ranger talent. The Marksman Rifle i use only for the PvE stuff, the SMG i use if NPC's get to close or if an agent goes rogue on me. When you're moving, always keep that SMG out so if you encounter a rogue you already have 40 charges build.
Armour: My chestpiece has unbreakable and i'm (trying to) run 4 piece System corruption (including backpack). Trying to stack as much crit chance and Crit damage as i can.
Skils: Repair drone and stinger hive. Stinger hive is suprisingly helpfull, i mainly trow it under the extraction rope so if a person decides to steal it, the stinger hive will interupt him cutting the rope, deal some damage,and force him away. Ofcourse you've got to stay close and shoot him with your SMG, othewise he'l just destroy your stinger hive.
Specialization: i'm using the Technician one for that +1 skil tier.
Using all of this i can sometimes down a rogue (or two, if i'm lucky) and survive, so maybe it can help you aswel![]()