Not too many indoor options in the Suwanee area. James Creek has a few indoor courts and outdoor hard and clay. They are more on the Cumming, GA side of Suwanee. On the 85 side you don't have a whole lot of options for indoor play.
Most tennis in Atl is subdivision based. So really you need to meet some folks and get on a team at your level which will probably be out of a subdivision.
Teams for spring ALTA are forming now. What level USTA are you playing?