Best way to learn is diving into a project ,guaranteed ! yes projects sometimes get to much but a little break away from it and all is fine again , whar ever you decide commercial or commersial and advertising versions , it simply has to show intrest because i am sure many love rts and need ssomething to point them in the right direction especialy when someone does not know where to start or how to do something , although i would encourage you to try and develope your system to be open to accept some custom ai because i think many ultimately want something that they have plenty of controll over to support their game vision but then again this is your baby were talking about here so dont lose faith in it and perhaps you dev it for your personal vision and create a great rts to show of what you learned and made all by yourself so far