I also enjoy the first 100 turns the most since you aren't settled in nice and cozy and have to fight uncomfortable wars against bully factions and that makes it satisfying. I make sure to marry all my family to make me some leaders. 3-4 castles is enough to supply generals as governors as they come out every 10 turns or so. You might want to take 3 elite units and go win some heroic victories against rebels to get some man of the hour popups and get free generals, or bribe some from other factions if you really need generals asap.
I'm playing with Savage and no matter what the AI will never be my friend

. I'm always labeled as a despicable backstabbing turd even though I never initiate fights and always try to keep friendly trade relationships.

AI comes raping my fields and plundering my women and the pope will immediately forbid me from attacking them less I risk excommunication, always

popoe too.
I tried HRE several times, I love their unit composition and want to play them so badly but I always end up getting swarmed. France, Venice, Genoa, Poland, Hungary, Denmark after 50 turns or so they all turn on me and send wave after wave and its just impossible to defend against. The dumb AI will just ignore all it's other battles and focus on screwing the player and will mindlessly send all its peasants and everything at you, even though you beat them the constant siege doesn't let you rebuild your forces in time for the next one so I don't know what to do there. Good luck to you

.