green screen motion tracking w/ RED camera

Hello Anyone! :)

I'm a director at a motion graphics company who has done a lot of TV and Music Video work with After Effects. Most of our techniques have been done in camera using stop motion animation. We've used AE for 10 years but I personally haven't used it for what I'm about to get into. So any tips or things to look out for would be very very helpful as we are shooting in a few days. Naturally I have some questions.

We are shooting scenes of a project (Shooting with the RED Camera) where we have a character in a black suit and tie who is wearing a green screen hood. He is acting out specific motions in front of a larger green screen syc. We'll be using AE to key out the background and his head. He will be a headless man running around. Then we'll make animated sequences in AE and track them to his head. The sequences that we create in place of his head must track perfectly to his body and the backgrounds must be stable.

I'm wondering :

Should we have multiple tracking marks on his head or just one? Also he will be wearing a white shirt and tie under a black jacket so will this spill heavily onto his collar? If so how can we minimize this? Should we black tape the inside of his shirt? Also... Do we need to have Tracking marks on the background if we are expecting those backgrounds to be stationary? will the background marks interfere with the tracking marks on his head?

Like I said. We've done a lot of work in the past but this is new to us. It's also last minute and with a tight deadline. Any help would be appreciated.

Best.
b