teh dosage will be stated on the bottle and there is no real "optimum dosage" per se but there are something of norms going on where you usually see test prop at 100mg/ml, test E at 250mg/ml but up to 400mg/ml is available... so basically the ratio will be determined by what your source has available and that's about all you have to do with it.. you won't have control over dosage unless you homebrew your own gear.