Beginner Help and Tips

This is my first NBA2k game and my first time playing MyTeam accross any EA game. I have some beginner questions about the mode. Right now I'm just starting by playing domination and trying to get some challenges done. I understand that a huge part of this mode is to get an OP team, but I'm a casual player who is unlikely to do much multiplayer. So while the questions I'm asking are about being efficient, I'm not out to become the greatest or anything like that.

  1. Should I spend MT on packs, or do I save for auction house (once I learn how to use that), or is there some other thing I should do with MT? I saw a post 4months ago where people said to save for when better packs are available, which seems to be now?
  2. I don't really understand the ideal loop for getting new cards. Help me out please: play modes and do challenges, earn MT, ???
  3. What should I do with players that I don't ever play with? Should I sell for MT, exchange, or auction house? Or is there some reason I should keep a copy of everything? Related: I'm intimidated by the AH--is this something I really should learn how to use?
  4. I'm not a completionist. Is there any value to locking in?
  5. Do shoes without takeovers slotted do anything?
  6. Should I be using my shoes on all my players or do something else with them?

Any other tips for just being efficient as a casual beginner are welcome. Thanks!