That sounds so exciting! If I were you, I wouldn't do anything drastic the first few years. I'd probably rent out a storage and put all the things I cant carry in there. In truth, but this is me, I can't say how long I could make it living like that on a boat (the answer is not at all as I suffer from sea sickness
) but you get my drift
You should have an extended trial period just to make sure that that is exactly what you want so that, in case it doesn't work out for some reason, you can just go back to the way it was before.
If in the meanwhile you decide that living on the boat is a life long decision, then I'd start selling ^^ but then your perspective on what you want to keep and where would probably have changed as you'd know what you can and can't have on the boat
All in all, good luck with your plan, it sounds super exciting!