Grats on getting a dingoo. Best thing for you to do is browse this forum and learn really. Their is a ton of great content for Native, dingux, and opendingux. Its up to you to decide what direction you want to go in. The dingoo can reliably run most systems up to the 16bit generation. Recent developments even make 2d playstation gaming possible. Good luck.
As far as turbografx emulation goes, its the only one i have issues with. hugo and ucpe are the only turbo emulators that i know of for the a320. The opendingux versions don't have sound so you will likely have to go with dingux or native. Till this day i still get graphical corruption in many games. I don't know if that's opendingux and native alike or what. have had trouble getting people to weigh in on that topic.