Okay, when you say get all the military ideas, what should i be getting? should i bother with the Espianage/aristocratic, or go diplomatic and something else. and how to take on ottomans by myself? i dont start with much of a navy. and at what time should i be finishing these conquests? Muscovy ottomans, TO, LO, and Kalmar union, is alot to have on ones plate.
iirc your NI "suck" until the final ones, meaning once you are on your 3rd an 4th idea unlock you get all your potential power (unlike france which gets its major boost on the first idea unlock, or milan -is it?- that gets infantry combat right from the start)
you want quantity plus two, or three of quality/offensive/defensive/aristocratic depending on how weak you feel compared to ottomans
quantity wont boost your power, will boost your manpower recovery, and your numbers (to try to match ottomans, who not only tend to pick it but also have forcelimit as part of national ideas), so if you have trouble with your manpower -likely-, this will fix that
defensive if taken early will give you the morale boost you wont get until later, not much else i feel. Morale is important if you can stack it so much that the ottomans start at 75% of yours, if so, you can count it as a power boost. You will need high prestige, PP, army tradition, being defender of the faith and so on for this.
quality and offensive will boost your troops properly to match/beat the ottomans 1 to 1
aristocratic will boost your horses and let you have military tech earlier, it is good to attack the ottomans when you are ahead
it is important to have decent economy so you can build mercenaries if your manpower dies off, ottomans are able to pull that off because their troops recovery is limitless, so for admin ideas pick whatever will give you a good military policy or something that will boost your economy properly, eg innovative or economics, but if you wont stay tall and start to blob admin would work i guess, as you will inherit the ottomans economy (their lands).
early on, specially if you pick defensive and get the morale, go for a morale advisor, later on go for discipline.
If you wont go tall, if you want to blob, you shouldnt be getting so many military ideas. One tops. You want the default ones (admin influence religious diplomatic and so on)
First war you dont want navies, and wont be able to get many ships anyway. You want to get your side of the strait so that next war you can cross it. It is possible to cross the strait on the first war (or just go around the other side), but only try that after you fully occupy the left side.
While galleys are best vs ottomans, I tend to go for 10 heavies 20 lights 20 transports with an admiral (more general purpose) and that wont utterly defeat a prime ottoman, only a dying one, after two major wars, your goal in any case wont be to defeat the navies, but to keep them in port, if it is possible in the first place, you stay in port otherwise.