Can’t decide where to start...

I'm guessing you're starting a new save, then? You could do a legacy, of course. If you don't want an "ordinary" legacy challenge, why not go for the "Fruitcake Legacy"? Got the idea from another forum member, and its quite fun. There is less planning and things are left to chance, like where your sim lives and who they marry. It was a step away from my usual controlling game, a bit uncomfortable, but very fun!

I've not typed up the "rules", really, but I'll of course do that if you want to go for it.