Very good questions bro. The dose you need is going to be individial. Some guys need more than others. It all depends on your response to adex and your response to estrogen. On average, .5mg EOD is a good place to start. Remember that the dbol is going to create even more estrogen, so while you are on it, you may find that you need a little more adex to control things, vs when you have finished it and are running just test alone. Its a balance. The only way to know for sure is to have your estrogen level tested.
So start at .5mg EOD and once you find what is working best for you, adjusting as needed along the way, I would continue running that dose right up until you start PCT. Then I would cut it back a little. Maybe .5mg 2x wk through PCT.