Ah, so many new, young hybridizers!
That is wonderful. As much material that is out there to get you started, in my opinion, it is "on the job training", since each iris is unique and you all have different ideas of what makes a beautiful iris.
Yes, it is good to study as much as possible, but in the long run, being consistent with your activities, keeping good records, and being able to discard the ones that are not up to standards, should give good results in the end.
The hardest part is the waiting.