I agree that getting practical on the water experience is key when it comes to learning
how to sail and general seamanship. Get out in the water as much as possible.
I donít agree that you want a race
boat like a 420. An optimist is almost too small for your daughter and would be impossibly small for the two of you. A 420 is unstable and relatively complicated for your needs. Youíll be better off with a family
day sailor, around 17í or so with a nice sized cockpit
. I donít know what are prevalent in Greece but something like a Flying Scot would be perfect.
There is a lot you can start to study now like navigation
. Yes on the water experience will provide necessary context for all that knowledge but being familiar with basic coastal navigation before you set out will be helpful.
Get in shape. Life on a boat benefits and at times requires a basic level of fitness and anything more than that helps. There are a lot of motions and things that youíll be asking your body to do and if youíre not in shape, at the age of 60 you may find yourself learning
by way of injuring yourself which is never fun. Flexibility is also important when you start cramming yourself into lockers or contorting to fix stuff.
I would be careful about selling your flat to buy a boat and if possible explore other ways of financing
it. A boat is a depreciating asset. If you can rent out the flat youíll maintain that capital instead of watching it slowly vanish as the value of your boat slides into oblivion. And youíll likely move ashore again someday.