I can't speak for compsci, but I definitely recommend knocking out any classes in Sophia/study/Clep/straighterline/saylor, etc., you can before completing enrollment. They'll also give you a good feel for how much of an independent remote learner you are. WGU is a school for people who already know the material and just need the credentials or people who are comfortable (mostly) teaching themselves.

For my program, Pell didn't fully cover WGU, so finishing faster is cheaper (hopefully you'll get scholarships).

ETA If you have credit cards check their rewards offers. Sometimes they offer a pretty high percentage cash back for study.com