a plan is a good thing to have but do not get discouraged when you hit a bump in the road (and you will!) you need to be realistic, and not expect too much from people when you are just starting out, or expecting everything to happen so fast like a lot of us do want. the hardest part will be the waiting. when you are waiting in between getting hormones, or what ever else and feeling like you just NEED to do more. it can really mess with you. i remember when i was doing therapy every 6 months-ish, and in between each session i would be going crazy trying to figure out what i could do in between each session. i started transitioning when i was 18, i did not finish (for me) until i was 23. that was with minimal hiccups (like having troubles finding a doctor who would do my shots right away once i got approved for hormones) just do not get discouraged because it is hard and keep your head up. the little things will make all the difference (changing your clothing, trying out a new name, etc.) and do not forget to enjoy the little things too when people start using that name, using your pronouns, etc.
and of course, as others have said therapy is the absolute first step. from there, you can make a plan with your therapist even like the next time you see them, you will have went clothing shopping or told someone, etc. that is what my therapist did with me to help introduce me to the idea/reality of living as male. the small things should come first as you are figuring it out as dena has listed some things. some seem so small, but they make the difference and boost your confidence and reassure you about your choices.