I think learning anything is easier if you learn hands on by simply doing it. Of course that is easier said than done if you have no clue what is expected of you.
I applaud you for wanting to learn something new- most of us could use a bit of learning something else besides chat forums, emails, pictures and web surfing. That can get boring and isn't learning after you've done it a zillion times.
I am guilty of spending hours doing mundane mind numbing stuff. I love computers too and should pull up my boots and expand my shrinking mind.
I sit here with a wonderful machine and many days it is looked at like just another chore to check emails when I know I am capable of so much more (and so is this poor machine- it is like owning a race car to do grocery shopping LOL).
The best I can do is give a few decent links to give you ideas of what others in the field or thinking of this endeavour are doing or have done.This is a start
And more here
. Here is a little video about web design
If you decide you'd rather learn with other people your local university or collage should have some information on where to go (if they don't teach this course). You will need a laptop for out of the home computer courses. Unless they provide computers but then you can't bring your homework home.