Yes you are correct Anavar is the safest choice. My wife takes 10 mg per day. She has tried winstrol, primobolan, and nandrolone phenylpropinate. She actually stays on a this low dose var constantly it has really drastically cut down on the number of migraine headaches she use to suffer from. In addition to this she doesn't get a period while on it, which she is happy with also. Keep in mind however we are not planning on ever having any children.
I must warn you however about taking primobolan as it is too long-acting an injectable. If the dose is too high, you will experience masculinizing effects, such as lowering of voice which can be permanent. You will have to ride out sides for the length the ester is in you body for.
Oral primo is a safer choice than injectable.
With the NPP my wife got more acne than with anything.
Winstrol causes an excessive increase in libido, and clitoral enlargement, which my wife was pleased with, but if not too high a dose is taken the more noticable masculinizing sides such as voice deepening e.t.c are not seen.
A good stack for women is actually a combo of anavar and winstrol. My wife put on some decent size using this combo.
And as I said before only use orals for now as if you begin to get voice deepening e.t.c. you will want to quickly decrease your dose or stop your cycle.
As for what doses to use, every woman is individual, some can handle more steroids without seeing side effects than others. You will have to begin with a conservative dose, such as 5-10 mg of var per day, or 5-10 mg of winstrol per day and work your way up to a point where gains are being made but side effects are tolerable. You will have side effects regardless, but they tend to have a hierarchy - i.e. first increased libido, then period irregularities along with increased clitoris size, and then voice deepening....
It's just the question of how far you allow yourself to travel down that road. For my Wife, we always backed off once her voice started to feel a little hoarse.
If you make your money as a singer, I recomend not taking any steroids at all.