As for multiples, the Allies tended to all fly the same planes together in a flight, so a couple of Camels or a couple of Spads would be good depending on which nationality you want to concentrate on, though this is not a hard & fast rule, as you could see Camels & Se5's or Spads & Nieuports at the same time.
For the Central, Germany flew more varied types at the same time, as they had to make do with whatever they had as the war ground on, so don't feel constrained to all Dr.1's or D.V's. Mix them as you like.
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