There isn't exactly a "guide" yet. But
this is the HG/SS "research" thread. You can get a lot of useful info from there, but pretty much you're on your own, other than asking specific questions here.
From my experience RNGing in HG/SS (Raikou/Entei/Dratini/Ho-oh/Latias/Mew so far)...
1) Download the newest version of the Reporter if you haven't because it has the new HG/SS "Method K" frames.
2) It's mostly about figuring out what works for your specific seed, because a lot of "consistent" methods of advancing the frames in DPPt aren't "consistent" outside of individual seeds anymore.
3) The Radio is a lifesaver. It is "d e c e n t l y" ... >.> ... consistent for advancing your frames.
4) Since there's no coinflip app to check your seed, you usually need to plan out a place to Sweet Scent to check your seed.