Noob gameplay/build pointers

Completely new to path of exile in general.

My first question is, how do I get my build info for my POE2 character so I can ask for help?

Second question (which I'm sure you guys won't be able to answer until you see my build/items/skills, etc) is, how do I fix my damage? I'm running my own merc build with no prior experience making my own. My biggest challenge right now is damage. I'm not saying I'm struggling but it takes quite a bit to kill even normal monsters on act 2 (regular). I've tried to upgrade my weapon, getting a better one, upgrading my skills, etc.

I'm not looking for a you guys to give me the answers, I'm simply looking for pointers that could lead me down the right path. The reason is that I would like (for as long as I can) to create my own "build" for my first play through and keep outside help to a minimum (like looking up someone else's build to get ideas for my own).