I would like to know what path should i take as a gunner, like if my gear is good, in what context should i use my weapon sets and any good gunner guide available. And btw I play this game f2p to the core, *so i don't have extra weapon slots or trinkets slots.*
I have:
Shadowsun Stetson
Nameless Poncho
Grey Owlite Shield ( UV shadow def low)
AP ( UVs low vs undead, vs fiend, vs fiend)
Volt Driver ( UV ctr low)
Shadow Driver
Strike Needle ( UV ctr low)
Gigawatt Pulsar
Magnus
Antigua ( to make a Blackhawk)
Cryotech Alchemer Mk II
Super Blaster
Autogun ( UV asi low, unbind)
Firotech Alchemer ( UV med vs undead, unbind)
Thanks
Consider looking at the Gunslinger Guide on the wiki page.
You're overall very balanced with your gear:
Normal, Elemental, and Shadow defense.
Poison and Freeze resist.
Strong Elemental shield.
DMG and ASI Med.
Elemental, Shadow, and Piercing guns.
From my 'short n' sweet practical gunslinger PoV' (which means this isn't the golden rule, but highly advised from experience), your weapons are your Alchemers and Blitz. Not Antigua (yet). Not Magnus (yet). And definitely NOT Pulsar (cause it's forever a dumb weapon and should be purely used as a swordie sidearm). Disregard the use of normal damage weapons at all, you need all the damage you can get.
What'd I'd suggest you use for general clockwork runs out of what you listed are:
1. Volt Driver (Specifically Volt because shock helps a gunslinger the most, alternatively use Firotech in shock stratums)
2. Shadow Driver
3. Strike Needle
4. Some sort of back up sword; I myself use DA for the purpose of knocking enemies away from me, but you can truly use anything here, like FF/BTB, Brandish, and Leviathan.
If there's anything I'd suggest that isn't included in your list, it would be Swiftstrike Buckler shield. This shield helps gunslingers incredibly with universal ASI High, bringing up your guns in particular to ASI Ultra. So not only do you attack fast, you're actually much more evasive too, which is ideal for a ranged attacker. You could also pick up a Chaos set (or Seerus Mask + Chaos for decent status resist) to further benefit your potent gun charges.
I noticed that you didn't mention trinkets. If you don't have those, definitely do equip them.