@DrCasey, sorry for the delay, work called.
So you’ll want to start with mostly 3* rainbow teams. This will help you with Alliance wars, color stacking for events and raids and also will give you a variety of choices to pick from for challenge events.
Team1: Mnessus, Bane, Chochin, Valen, Hawkmoon
Team2: Balthazar, Melia, Gunnar, Nahmage, Friar Tuck
Team3: Azar, Ulmer, Gan Ju, 2nd Balthazar or Renfeld, Berden
Team4: Brienne, Jahangir, Gato, Tony Danzaboro, BT (until you get him leveled)
Team5: Scarlett, Kiril, Prisca, Grimm, Karil, Isshtak
Last one isn’t a team, unless you’re stacking blue 
, but hero’s to work on and have available. I went back and forth and tried to catch all the hero’s you have. There are a few on the list I don’t personal like, mainly, Prisca, Renfeld, Friar (but as you are low on healers he’s a necessity)
So for your 5th team you’ll want to put your hero in a specific order on defense. You can mess around a bit but this link will provide you with a good idea of progression.