Don't do it unless you really just love the black suit. The sp you spent getting to level 4 could have gotten you 2 or 3 levels into assault or logi suits. The basic suits are substantially more expensive to run, without any of the racial or class based perks.

This.

If you really like Gallente you should definitely specialize. The suit is the weakest medium suit in game at the moment (because lolarmor), so getting at least a bonus from suit skills helps a lot really. The fittings I recommend are based on the Gallente Logi which imo is much better than the assault. I would like to know what weapon are you using at the moment. If you aren't using an hybrid technology weapon (ie. AR), then it's no use getting the Gallente Assault. Knowing what weapon you use is also relevant for deciding if equipping damage mods or not. Gallente suits can hybrid tank (shields/armor) so that they can survive more.

Gallente Logibro Example Fitting:

-High base damage weapon
-3 Complex Damage Mods
-4 Complex Ferroscale Plates
-1 Complex Amor Repairer/Reactive Plate
-Flux/Core Locus grenades
-Triage Nanohive (heals armor)
-w/e equipment you wanna use

Hybrid Logibro:

-Low base damage weapon
-3 Complex Shield Extenders
-4 Ferros
-Armor Repairer/Reactive Plate
-Nades
-Nanohive
-Equipment

Let me know if you need more specifics.

-XOXO

Then definitely go Gallente Assault so that you get the hybrid weapon bonus and the sidearm. Be sure to have a nanohive that repairs armor. The TAC AR has high base damage so you should equip damage mods and keep your distance.

-XOXO

What kind of tank should I fit then? Repairers? Reactive Plates? Plates? (PS Thanks for the advice so far =D)

Pretty much equip all 4 low slots with complex ferroscale plates, or basic plates if you don't have enough CPU/PG. The nanohive that repairs armor should get you covered with the armor regen. Exchange a plate with an armor repairer/reactive plate if you feel it's needed.

-XOXO

The hybrid bonus isn't very significant. I find that logis assault better than assaults...
You'll want an armour repairer on there. Even if you have triage hives (which restricts you to using weapons with good ammo economy unless you use allotek) at some point you'll run out of those and they're not always convenient to drop.

I would also seriously consider getting the non-ferroscale plates simply because their armour bonus is huge compared to the ferroscales. You'll move slower, sure, but on a proto gallogi you can easily push past 700 armour doing this, with a solid rep rate, whilst carrying triage hives, a scanner, ammo hives, and whatever else you need.

Sample Gallogi fit:

Duvolle Tactical Assault Rifle
Core Locus Grenade

Complex Damage Modifier
Complex Damage Modifier
Complex Shield Extender

Enhanced Armor Plates
Enhanced Armor Plates
Enhanced Armor Plates
Enhanced Armor Plates
Complex Armor Repairer

Wiyrkomi Triage Nanohive
X-3 Quantum Nanohive
A-45 Quantum Scanner
Nanite Injector

That'll give you 709 armour, a passive rep rate of 11.25 HP/s when not using the triage hives for your armour, a little bit of a shield buffer to help against explosive weapons (which is almost a necessity for armour tankers), a prototype weapon buffed by two damage mods, and the magical explosive devices known as core locus grenades.
You may not be able to fit all of that yet, but it makes an excellent goal.