You've already taken the hardest step, the fact that your Mom supports you is huge.
Really the next thing to is just keep educating yourself and plan out a transition timeline for yourself.
Just remember, the only "right" way to transition is the way YOU choose.
You'll want to find a doctor who is familiar with trans issues and you'll need a letter from a therapist for top surgery if that's what you want to do.
I don't know how old you are or which/what part of the country your in but there are loads of resources on this site to point you to services in your area.
As to having to deal with unwanted attention because you look like an attractive girl, know that most of what makes a person attractive is pretty independent of their sex. The people who were hot in the bodies they were born with tend to look really hot after they transition too. Just try to think of it as money in the bank

Don't panic and remember to breath. What you're going through is not easy but you're going to be fine.