Made a fighter. I need a torch, but I got a flail in the main hand. How do I prevent two-weapon fighting from screwing me over? I want him to only attack with the flail, which is what I'd do on the tabletop. (Funny thing is, my other character got a cold-iron long spear, which I was actually gonna use on the fighter, but alas)

What about having a caster use the Light cantrip on your character?

Yeah can't help with your issue but ditch the torches, casters have free light spells.