I only recently downloaded DCS for the first time in the last sale. I was sorta semi-disciplined about what I bought and also quite structured: I created a spreadsheet with all the modules: terrain, aircraft, paid missions. Then the following thought process:
1) All terrain, as I don't want to be held back from activating any missions. And I want location variety.
2) Stick to jets, although both vintage and modern. Props maybe someday, but for now stick to jets.
3) Focus on NATO aircraft where I can read the instrument panels without learning Russian in addition to learning how to fly.
I broke this rule by getting the AJS 37... NATO yes, but controls in Swedish... but hey. I read the reviews and it looks like a pretty unique aircraft and seeing as we don't yet have a Buccaneer then the Saab will have to do.
4) Only buy modules in a sale, never at full price, unless I run out of modules to learn (which will take years).
Having set this criteria I've now spent some money on modules, all the missions for each aircraft purchased and 1+1/2 HOTAS setups. I am pretty determined to fly each module. I've already started an learned quite a lot in the A-10C, but I understand that while the airframe is easy to fly, the mission avionics are very complex.
Any advice on which order to learn aircraft from the following list?
1) A-10C
2) F-5E
3) F/A-18C
4) AV-8B