Congratulations!
I bought what I didn't have from the cheapy tool mart and specialty tools at Aircraft Spruce - 37deg. flare tool and a real good pop rivet squeezer. Have sufficient ventilation and lung protection when grinding/painting. I agree with Ralph on the EAA "Hints for Homebuilders" videos and worktables. Dremel tools are essential.
I used this hand belt sander a lot.
Enjoy your build!