[Loveless]

You can train your fighter in the same places as other classes.

20-30: Moonlight
30-40: Vine Tomb/Goblin Camp
40-50: Collapsed Prison

Or the equivalent Abyss maps

The Fighter class may seem like a money saver but if you plan on PvP and tanking you need to carry an axe plus one-hand plus shield. You'll also want to be enhancing all three or buying if you want to be useful.

Tanking build is 50 END rest STR or 25 SPR, 50 END, and rest STR.
For PvP you may want 50 DEX and rest STR or same as above with END/STR/DEX gears.

... and use the Search next time please, all of it has been answered.

--

EDIT: I just merged all your question thread.