For the Brooklyn pick, assuming they use it, I guess I'd go with Poeltl or Dunn as my "binkies" there. I think they're likely to be the best players available where the Celts pick, and two guys who I'd expect to make it into the rotation right away.
Later on, Luwawu, Valentine, Levert, Sabonis, Prince, depending on where the picks fall. Target experienced multipositional guys who can theoretically defend a bit, keep the ball moving, rebound a bit, and spread the floor a bit.