There is also this:
http://52weeksofblues.com/?page_id=403
Which aims to teach one blues song a week for a year. I tried to start this in Jan 2017 after playing for 6 months or so, but I wasn't good enough to get each song down in the allotted week and I gave up after about 3 weeks or so. Perhaps I should give it another try now that I have a lot more practice under my belt.