How long does it take from buying a brush set, canvas and colors to selling the first very high quality artwork? Wait, someone would have to teach you about images and draweing techniques first, before you can draw them with these tools. I mean understanding a brush won’t make you understand the Mona Lisa, and you won’t appreciate a brush until you know what else was needed to create that fucking rag. Some take years, some get it very fast. Having wits and knowing the internet are catalysts. Having a kung foo partner like you do maybe could be a catalyst, too.
As others have said, if you keep at it daily (like anything musical) the key commands and techniques come really quickly. I will also suggest ear training to make better use of the program as it really helps in general. Renoise is pretty complex, but it’s a lot of fun, enjoy!
ps. make good use of the forum search as well, there is a plethora of info on these forums. I spend a lot of time lurking for that very reason!
pss. The A key is also a note off, a lot easier than caps lock!