@TwoCats - Hello and welcome , i was also into action script and games development but as flash was discontinued first by apple and then by every one else every thing kind of collasped, i now want to start in web development, i was a member of one other forum and they do talk about knowing backend stuff as well, every one seems to agree that HTML+CSS+JavaScript and PHP/mySql is really very much in demand and everyone is raving about nodejs as well ....
I am a subscriber to the IWD(interactive web developer course)
I have completed the HTML course and about 30% of CSS course and i can say that it is a great course, stefan has chosen to call them introductory but believe me he goes very deep in to what he called "nerd" topics but not in a rush ...
I will surely say for some one who has been there and done that , this will not be very difficult ...
Wish you good luck which ever way you decide ....
Amit