Hi Darryl,
I bought an acoustic guitar 20 years ago, and approached it with the idea to play simple songs ( I was really into the Samples at the time) and developed a good understanding of chord shapes. But then that got boring and I sort of left it.
I don’t know scales, and my strumming has always been pretty organic (read bad).
I hope that I haven’t developed bad habits that can’t be broken at this point, but do you have a recommendation of where to go in your courses to start?
Hey Pete!
I’m sure I wrote an article on this somewhere but I can’t seem to pinpoint it at the moment - I’ll have to make another. I also share some tips on where to start in the FW Premium onboarding email if you opted to receive that upon signing up 
Anyhow, allow me to try shed some light on your case. There are two things I would suggest to you:
Identifying Bad Habits
As a Fretwise Premium member, I encourage you to use the Video Exchange to help me help you to identify any potential bad habits you’re worried about in your playing. Embed a short video clip of you playing guitar, and I can point out what needs work.
Where To Begin On Fretwise
Generally for most students, I recommend starting off with the CAGED Fretboard Visualisation Masterclass, followed by All About Triads. However it’s important to ask yourself - what inspires you? What’s your goal? Do you want to learn more about the instrument and music as a whole? Or do you just want to play music or improvise? Of course, usually we enthusiasts want it all - and there’s really no reason why you can’t study multiple topics simultaneously if you’re wise about it. Anyhow, since you mentioned about scales, that would suggest you would like a better understanding of the instrument. In that case I would recommend the CAGED Class 