a question for makeup lovers and skin care enthusiasts!!! help

sooo i have a couple questions and even if you can only answer one that's fine! i just need some advice and suggestions. (name brand or drugstore makeup doesn't matter)

what is a good mascara that is water proof and holds a curl? i just really want a good mascara.. the struggle is real😂

HOW DO I GET RID OF ACNE SCARS?!

do good brushes make a big difference? which ones work for you best? getting sephora's set of pro brushes have been on my mind for a while.

cream contour or powder?? i've just started to practice the art of contouring.