first practice kit. any advice?

i'm very new too soldering and looking for any advice at all. the ones on the left of the board were my first attempts, so ignore those. also wondering how to get power to this thing, and how to use flux properly. do i need tweezers?

i'm very new too soldering and looking for any advice at all. the ones on the left of the board were my first attempts, so ignore those. also wondering how to get power to this thing, and how to use flux properly. do i need tweezers?