There is another thread on here that goes into some pretty good info for women but here is the basic summary:
Use only short estered gear (orals or injectables that only last a few days) that way if you start getting symptoms like voice, clit, hair changes you can cut the gear and stop the changes before they get worse. If caught early the changes to things like voice and clit are likely not permanent but hair loss or growth isn't easily reversable.
The best strategy is to start with a very low dose of a single drug and work up slowly over the weeks until symptoms appear, stop for a few days to let excess clear, decrease the dose below that point in the future. You now know what your limit is for that drug.
Stacking can be done where women can take more total gear by adding different compounds without hiting that virulization ceiling (ex max dose of winny is 20mg/d but they can take 15mg/d winny with 15mg var/d without a problem). If stacking do it by running a single compound, finding the ceiling, then adding other compounds and increasing until they find the ceiling with the two together.
The least side effects for women are from the following compounds:
Nandrolone...NPP is a good choice for strength and lean mass gain with little water retention, seems to have least virulization...deca durabolin is a bad choice due to ester length
Winstrol...winny (inj or oral) is frequently used for strength and to help cut up. Seems to work very well for women but will give virulization pretty bad if dose is exceeded
Oxandrolone (Anavar)....similar results to winny but effects different people in different ways. some girls prefer one or the other because of how their body reacts to the different compound. Some get bloating pretty bad on var so they like winny better.
Proviron...works to reduce estrogen, free natural test, and help girls harden up.
Primobolan...very effective lean mass builder but has potential for strong virulization if max dose is exceeded so they need to be very careful. Primo is typically an enanthate ester so it is difficult to use safely. the oral version is not very effective because the cost is very high to get an effective dose.
Overally girls are much better off using a very small dose of gear (the minimal that will give results) and focusing on nutrition/excersize to acheive their goals.