Hello Baz
I've been flying quite a while - learnt on Chipmunks while I was at school - done quite a bit over the years in Australia & overseas - all private flying - quite a bit of IFR - some long flights hopping across a few countries. Also done quite a bit of sailing, again Australia and overseas - a few long ocean races etc.
Enough of the background - my advice is try gliding first - I've done quite a bit and started not long after I finished PPL - again Australia and overseas. Even been gliding out of Lake George back in the early '70's with ANU Gliding Club when the lake was dry - ridge soaring ie under the controlled airspace . A fair bit of water buggers that venue now.
The thing with gliding is you generally need to put aside the day and in the early stages it's only short flights. The advantages to you are in my opinion huge - you will learn stick & rudder skills, you will learn that those pedals are not footrests, you will learn what a balanced turn is, you what a stable approach is, you will learn speed control, you will learn stalls and spins - properly etc etc
Further, you can start now - for the sort of flying you need initially, winter gliding is great - contact these guys https://canberragliding.org - There are other clubs too.