Hello!
You're very smart to research hormone therapy prior to your surgery. It's good to know what's available so you can discuss your preferences with your doctor, if keeping your ovaries isn't an option.
Generally, estrogen only is prescribed at first. There are various types of estrogen, which you can read about in articles 8 - 11 in this resource:
Hormone Jungle Articles. Bio-identical estrogen from the pharmaceutical companies is estradiol only. To get both estradiol and estriol, or estradiol, estriol and estrone, you would need to get a prescription for either biest or triest and have it filled at a compounding pharmacy. It's an option that you can keep in mind but I think estradiol is a good starting point.
Women without a uterus don't have to use progesterone to avoid the increased risk of uterine cancer associated with using unopposed estrogen with an intact uterus, but that's not to say that you won't find it beneficial. Whether you need it post-op or not will depend on if you're having symptoms that would be helped by using that hormone.
Doses of Vivelle Dot, from lowest to highest, are 0.025, 0.0375, 0.05, 0.075 and 0.1. Your doctor can suggest which dose is best suited for you. It really varies from woman to woman. The goal is to use the lowest dose that provides symptom control. I'm 54 and use the 0.1 dose.
Whether or not you'll need testosterone will depend on whether or not your levels of free and total testosterone indicate that you need it. Many women don't but if you do, make sure you balance first with the other hormones before adding another to your hormone therapy. If you make too many changes too quickly, it's going to be hard to figure out which hormone needs to be changed to control symptoms.
Expect to experience fluctuating levels early in recovery--it's common with or without ovaries, on or off hormone therapy. Your body will be depleting hormones your ovaries made while recovering from surgery and adjusting to a new source of hormones. Consider keeping a symptom journal so you have a written record you can share with your doctor. Your doctor can interpret that information and adjust your hormones accordingly.
I hope this helps you!