Im not gunna be spending alot of fg on items so mostly just using wat i find

One person tells me to put it in Dex and another says Vita cuz im not using awesome gear

Any helps appreciated

you play sc so imo vita is not needed

if you prefer to have a high life at high levels, then only put the 10 first stats into vita

then it depends on your gear, dext is cheaper than str on items
but you'll need dext AND str

at lvl 60+
you should get (80-120 dext ) ( depending on your type of weapon )
the rest in str once you're done with the dext

it is also adviced to keep a good balance between dext and str all along your levels

This is mad noob question , but was does Dex do on a fighter?

Well that can just be found in the faq

Dexterity: Increases your chance to critical hit, and damage dealt when you critical hit. It also reduces damage when enemies critical hit you. The effects are subject to a diminishing return formula.