Honestly, the only stuff you need to know is

Recording (Good choice of replays to suit the song, freecam nice and smooth, highish fps so that you can slow down replays without problem)
Music Choice (Something that can be synced to and is a nice song that you like overall)
Sync (Replays can't be too fast or too slow for the song, get the hits to sync with the beats/voices/whatever)
CC (Fit the song)
Effects (Screen pumps, glowy stuff, 3D stuff which I can't do, particles, etc)

PM me for my Skype if you have any more questions