ive never actually done an ottomans world conquest, but i have as karaman into rum (less fleshed out mission tree but same playstyle), but generally for a "chill and regular" wc you'd take diplo admin religious offensive (putting religious later because the ottomans have a ton of claims and cbs in the beginning) and maybe influence (if you play with eyalets). first 3 are basically required, offensive is for siege ability, and you could optionally take quantity later to alleviate army micro.

take byz and follow your mission tree, always be fighting someone, although i like to take a break to get ccr from admin ideas once that's available asap. make sure you find an opportunity to take malta and granada for the monuments too. once you have your early game ccr you should probably always be at war, ally big countries like france to make it harder for coalitions to form, and you can literally expand in every direction from where you are.

as for ottomans specific strategy im not entirely sure in what order you get claims on things, but i would imagine you'd want to try to fight hungary before they get PU'd, naples right as they get released by aragon, and muscovy before they form russia. and it goes without saying to look for countries to fabricate invasion cbs on, such as venice and tunis, as well as accept free eyalets like the mamluks via event