There's not really much tyre prep. Clean the tyres with some sort of alcohol, Much More have the Blue and Red tyre cleaners. Apply the tyre additive 20-40 mins before the run.
There's loads of tyre additives out there:
LRP tyre traction...
Much More have four different I think...
Corally Jack the Gripper
Paragon (smells like hell)
All people have different oppinions... But the LRP do work good, start with that one