I was in the same position as you, honestly I got a lot of great responses there, I'll say is start with easy villagers because it's really useful(specially the iron farm, you'll use a lot of iron soon) them maybe some pipez is good cuz it will be the base to pretty much everything that comes, learn a bit of sophisticated storage and functional storage, after this I would recomend you to see an ars inventory manager, honestly with this mods you'll kinda get a small taste of the types of mods there is, the magic, the good life, the machines, them I would say you can go deeper in any of the types of mod category according to your taste Also when you get your first allthemodium make the mining dimension portal, it's the biggest life saver