I know it's not about the money, but in a little while, a lot of things will be about money.
One thing I regret not doing is having a little wad of actual cash - so I'd start right now, taking a bit out, using cashback on the shopping, and getting a few grand in cash stashed somewhere he won't find it so that if you ever need it, it's there.
Second thing I regret (although if you don't want to keep the house, perhaps it's not great for you) is buying any new appliances I needed before I pulled the plug - they cost a fair whack, but aren't worth anything second hand, and they're practical, useful things.
Definitely ask the solicitor (and maybe accountant) about gifting money to your children pre-paying for things where you can (at least if you're spending the money, he can't - he has his own credit card yes? Not a second user on yours? Because he could run up a credit card bill and stiff you with it - and yes, in theory stuff is 50/50, but in practise over the amount of time this takes, that doesn't really matter and you will have do deal with it)
I put a load of money in credit union accounts for my children, which excluded from my required statements - I checked that with my solicitor, but I don't know if we were both just being very careful about what we said/heard and this wasn't strictly speaking correct.