I suggest learning a vertical stitching pattern over a horizontal one idk if thats obv but its how I ruined my first jacket LOL
use 1/2 acrylic paint 1/2 fabric softener to match diy fabric paint, HAND WASH DO NOT MACHINE WASH AND AVOID WASHING AS MUCH AS POSSIBLE! You can wear undershirts to maximize ur usage between washes but if u must wash it just soak it in some COLD soapy water and then hang it to dry.
I use parchment paper to make stencils but tbh its hella annoying so if you know any more effective methods lmk lol
Make sure u got some political patches riiiiight up front. I tend to save my politcal onez specifically for jackets and I save the more artsy or funny ones for the back or just patch pants.