I'd try to get most f2p skills like cooking, woodcutting/firemaking, mining and smithing to like 60, then you can do a bunch of membership stuff. but if I'm cutting trees literally to just burn that, I can just do that as f2p. Fishing is kinda annoying to as f2p though but doable
Yes, that would be a good tactic, at least you would go p2p with lvl 60 skills, that way it would be much easier to maximize and start farming gold...
I just wouldn't level combat in f2p, because it literally takes too long, and in p2p with ed3 it's much faster and better... in hours you get at least lvl 90 in all combat skills...
and already in p2p, regardless of the lvl, I advise you to do 2 things to get money: make VIS Wax and make a rune purchase diary in the shops, I believe that you can get about 4m to 5m a day just with that, it helps a lot and they are quick ways to do it