I've seen research that supports the theory that the muscle building effects of supraphysiological levels of testosterone breach a sort of threshold at approximately 500 mg per week. Lean muscle gains seen from 500 mg per week cycles are exponentially greater than those realized at lower doses.
Therefore, I'd advise 500 mg per week to be a good minimal starting dose of testosterone for a newbie. However, the use of drug stacks may lead me to reconsider.