While I'm still in the process of learning A10, I got some assurance with the KA50 pretty quickly using this step by step method:
-learn the very basics (the ones you seem to know by now)
-try a mission, and fail. Then understand why you failed. What particular skills you lack to actually succeed, and what system you need to learn (not necessary master, at that point) to do so.
-read the manual regarding those systems, check the forums for the very helpful folks advice around here, watch tutorials, try again with your fresh knowledge. Mayebe fail a few more times. Eventually, you'll succeed.
-proceed to another mission. And another. Until you find another aspect you need to learn before continuing. Etc...
After some time, you should find yourself quite capable of handling most casual avionics without much trouble. From there, you'll know how to perfect your skills naturally.
The most important part is to avoid being overwhelmed by informations. One step at a time.