Advice for New Players, or "All the things I wish someone had told me when I first started."

Okay, little update after event. I took 4 event pulls and got Valen, Kiril, Carver and Tuck. No special ones this time either.

According to:

I’m soon gettin Karil finish, so I focus on Kiril, then Sonya and then Valen?

I think I can fed Ulmer, but Olaf is back up for AW’s?

I think I need to leave Wu Kong to 3/60 because I don’t have magic orbs, so Gan Ju is next one on the list.

Is there any sense to use emblems on 3* heroes? I have seen those, but I wanted to save them, because they are hard to get and one hero consume so much those.