how not to overuse medicated shampoos?

[novikuez]

hi,
My hair has been thinning for a while, I am Norwood 2-3.
I want to use this shampoo combo:

Nizoral
T/Gel or T/Sal
Infusium 23 + conditioner
L'Oreal Vive for Men

1. How to use them so it wont be an overkill?

2. If I want to use a volumizer, do I need a buildup remover once in a while. If yes - which?

3. Isn't Infusium a buildup remover?

Thanks,
J