Like I said, I am no horde expert... so I don't know which provinces you should raze, which you should spare and work on.
When you say "develop", do you mean developing provinces with MPs? If so as a non-European country you should pretty much never develop anything except to spawn an institution. If you plan to keep pace on tech by developing institutions, then look for a cluster of farmland provinces (development cost reduction), preferably with ports and somewhere in the heart of your empire so the institution spreads rapidly.
For Ming, I use the Hangzhou area, but I never played Timurids, so I'm not sure if you got something suitable.
Edit: To clarify when I say "cluster", I don't mean you should develop multiple provinces at once. I just mean planning ahead, if you intend to develop institutions, you should focus your development provinces in one area, so the institution spread can cover your economic core asap so you can embrace it asap.