You've started the process.

Then, most get a gender therapist (not always necessary, but I found it hugely helpful, just by being able to talk about stuff with someone knowledgeable, who could ask me lots of questions and who listened to my answers.) The therapist will usually write a letter stating you are trans and ready for hormones (most endos require this, not all). So then you go to the endocrinologist and start T. Mind you there are many trans guys who opt not to take T for various reasons; a gender therapist can help sort out whether that is right for you).
Somewhere in that process most choose to change their name legally. Doing that requires that you find out how to do that in your area. Most involve going to probate court, filling out forms, paying a fee, posting a notice in the paper, and finally appearing before a judge. Your state/country will vary.
After that you change your name legally everywhere, get new ID.
Then, if you're interested in top surgery, you find a surgeon and get that done. After a year or two if you're interested in lower surgery, you find a surgeon and get that done.
That's it in a nutshell. People do things in different orders, some elect to do some things and not others, depending on your gender ID (male? androgyne? genderqueer? etc).
Jay