Start at the Druid Grove since thats time sensitive with only 3-10 rests before things go bad, and you'll wanna save those tieflings first. Picking up Shadowheart and Lae'zel early is crucial, since leaving Lae'zel in that cage too long means she might not make it through the Mountain Pass later. The creepy hag Auntie Ethel needs dealing with pretty quick, and make sure to grab that hair thing from her before moving on cause its a one-time deal.

Interesting tip about the goblin stuff, once you side with anyone theres no going back so think carefully before helping Minthara raid the grove. The Underdark has some really good gear in the Whispering Depths and Festering Cove, definitely worth checking out before moving forward. Watch out for Counselor Florrick and that shadow-curse thing with Rolan, they both need quick action or things go south fast.

The game usually warns you before big story points like entering the Mountain Pass or Shadowfell, but maybe take some time exploring everything thoroughly first cause theres no coming back once you move on. Some cool secret areas in the Zhentarim Basement too if youre feeling thorough just saying