what stats should i be building in for a fighter (lvl 3 atm)

Looks like you will be using swords, shoot for ~ 110- 120 dex with your gear on and all your other stats into str.
Look for: ee on your sword, dex on your armor or ee, dex or str on your charm ( dex is generally cheaper- would probably suit you better ).

115-120 dex usually does the trick. i assume youll be in catas often i find that after many climbs 120 dex gets you a higher avrg in catas than 115 or something under than so.
But ofc, we all have preferences, just try out 120 dex. rest into strength.

For weapons: swords, if you're budgeting do lvl 0,5 10, 15, 25, 35,45,55 swords. the earlier level swords are cheaper so you can go for a higher ee amount but at 25+ they get a bit pricey so from
then on every 10 levels for a sword.

its lvl 0 60ee, lvl 5 80 ee, lvl 10 100ee...and so on if you see the pattern.

Armor: Wear Chain or Plate Mail And Get as many stats as possible. Str and Dex together is expensive so if you're budgeting go dex build. so find dex chain or plate mails

charm: as many stats as possible.

oh noes

not the 120 dex again