You will need to be referred to a gender clinic, where after assessing you they will refer you to an endo clinic, who (unless you have any serious health conditions - unlikely) will prescribe you with blockers.
The process of getting blockers varies from person to person and in different countries, although the typical wait is usually about 1 year.
There is a lot of useful info on the forums, and a lot of people willing to help, as long as you follow TOS and Dena's advice. There's always people happy to help.
Good luck!