Being an organic chemist by trade, i love mention of the "home brew." If you meant synthesis of steroids from raw materials (yam extracts, etc), the process is NOT cost effective, much less within the reach of 99.9% of the general population. Powders on the other hand are the most inexpensive route.
To get account dosages for orals, you will need a scale accurate to the nearest milligram. Just weigh out the powder each day, cap if you feel really ambitious.
For injectables/suspensions it is easiest to dilute to the desired concentration. Suppose you have 50 grams of prop and want a 100mg/ml solution:
50 grams = 50000 milligrams
50000 = (100)(X milliliters) => solve for X, X = 500 milliliters.
So add enough BA/BB to dissolve the powder (this info is easy to find) and enough oil to reach 500 millilters. Enough prop for you and every kid on the block!