(Any comments about Sonic Boom will be ignored. That is a different universe altogether. Besides, Adventures of Sonic the Hedgehog and Sonic SatAM came out the exact year.)
From what I remember, the comics were based on Sonic SatAM (I used to think it was the other way around), so It'd be pretty interesting to go from Show to Comic to Show. If that's the case, I want this to be like other animated comic book adaptations, where it's sort of a retelling of the story arcs, but it has some changes along the way, as well as original stories. Heck, considering the how the quality of the comics were in the 2000's, plot holes, and bad continuity, it'd be a good opportunity to fix all of these errors.
Cast (For the other characters that hasn't appeared in TV yet):
Mina Mongoose: Hynden Walch
Barby Koala: Laura Bailey
Hershey Cat: Jennifer Hale
Geoffrey St. John: Steve Blum
Mammoth Mogul: Clancy Brown
Fiona Fox: Tara Strong
I would start at the beginning, where the freedom fighters first formed and explain some back stories of the characters. I'm not a fan of shows that just start at the middle and just was kind of there. That and Eggman is the more iconic villain, so it makes sense that the first season would center around Dr. Eggman.