I don't think you'll manage to master retopo in one tutorial. Just read a few tutorials (better for theory), then watch anything you'll find on Youtube (choose short ones, they're usually better, more explanations and less "just working"). The worst problem is not retopo itself, but learning to make a proper mesh. In your case it's not a serious problem, as you're not going to animate organic beings, but anyway, keeping the mesh even and loopy is a tricky stuff
Thou not impossible.