I don't know enough about money to name a figure. I think a legends deal like what Nash got (but, um, more) if appropriate. As for appearances, limit it to promotional appearances before WM, a WM match, and maybe some TV appearances after that. Maybe a Summerslam match this year with another big name opponent. Since I'm Sting, I can safely say that I don't care about title runs.
I'll deviate from expectations here and say that I want Undertaker at Summerslam. Why make the result so predictable? I don't know who to ask for at WM, but whatever. Pay me.