I'm not doing much to prepare, I have a small framework I have built up over the last year or so, it's all in C# and using OpenTK/OpenGL 4. It has some very simple graphics (mainly 2D), sound and AI examples I can hopefully build a game around. I've tested its still working today, the upgrade to windows 10 a few days ago does not seem to have broken anything.
I'm quite anxious, and will be glad to get started. Good luck everyone...