Hi, Im level 15, does anyone know where I can a helmet not a little metal neck case, btw im sith juggernaut, I have tried the galactic trade thingy but no luck, help?

I don't remember what level, but you should be getting one from a quest soon, some gear only becomes available with levels, don't worry you'll get it =)

I saw some in my GTN, L28ish through the low 30's.

 

They probably don't show up until L27/28 like they did in that other mmo for the longest time.

HS has some that drop as do the Flashpoints latter on. Your class quest chain should give you one in the 10-20 part of the chain

I'm on my second piece of headgear now from quest rewards in Dromund Kaas. I'm Level 16.

 

So questing should be your answer and you should be due soon

Helmes are like implants, you really don't get them until the game doles them out to you. For helmets it should be right around 15, for implants it's ~23 or 24.

 

Also, if you don't like the look of your helmet, just turn helmets off. It's in the Social tab of Preferences.

The Quest "Bomb Disposal" on DK gives you a headpiece.

lvl 16-ish

At the moment you're on a far too low level to be getting full headgear from the GTN and questing. On Dromund Kaas You can only get the Darth Malgus style breather and the same with balmorra and Nar Shadaa all the way till Tatooine. The first full headgear which covers your entire face, is I think the Gladiator helmet which can only be equipped at level 26.

So you still have a long way to go unless you're satisfied with the Darth Malgus breather headgear.