Well, that's the gay way to do it.
Myself I would start conquering muslim nations in a smart and efficient way. Tripoli and Tunisia, then move against Algiers and Morocco. (But yes avoid nations allied with the Ottomans, go for easy pickings to begin with). (Syria is fun ally to have)
Your orthodox neighbours are also an option. Georgia and Russia for example.
Asap you should get out and get colonials though, to better your income and your supply limit.
Also if you are able and have the money build a fleet to block off the ottomans (or wait until they are in war with timurids or castille) and just grab some.
You start as empire, use that holy war CB wisely! Fawk those rebels, be like Alexander the Great! See the movie "Alexander" for reference, you don't have to kiss a number of dudes though, let's leave that to Drattius and his rebels.
Sounds like a sure-fire way to get into the problems that arises from being scattered all over without a strong defensible core. Definitely not a methodical approach.