If your plan is set and I believe it is a very good plan to have.
I believe the way to go over the next 4 years of the 5 year plan is as follows.
A: Do as much sail training, study and practice as you can, on other peoples boats is best, there is always somebody looking for crew somewher.
B: Become an avid collector of money
C: Start downsizing all that stuff you have collected over a lifetime. So by the time you arrive in your 5 year you are not being tied down by goods that are of no use on a boat. The stuff you can not part with and not take on a boat is going to cost one way or the other to store somewhere, less is more.
The last year is the time to start narrowing in on type and style of boat, because by then you will know way more than you do now and also have an actual budget
as opposed to a fantasy budget