Air squad - order for stars/skills?

Hi All - finally making the switch to air current heroes are:

3* Carlie, 3* Schyuler, 4* Lucius, Morrison, DVA.

Going to do Carlie and Schyuler to 4* and Morrison and DVA to 5*.

I have enough left to do 1 more hero (Carlie, Lucius, Schyuler) to 5*.

Was thinking Carlie as she's the main tank. Any thoughts?

Also, these are brand new chars... was going to do Carlie/Lucius to 20 on 2 defensive skills, but not enough saved up to do more than 2 to 20 on the offensive. Any specific things I should concentrate on?