If you have a community college there should be web courses in web design. I know this is going to sound strange, but check to make sure the instructor is more of a web developer than a web designer. That way you learn more on how to actually build a website. (No offense to web designers)
If you go on it on your own I would recommend learning fluid design then work yourself into responsive design. That way you learn about the fluidity of web development using percentages and not relying on pixels (px) instead using em units when it comes to fonts, widths, heights, etc... Then when you get into responsive design stick with mobile first approach (My Recommendation) or PC first approach. Don't try to do all at once, by that I mean PC, Tablet, and Smartphone.
An get a current HTML/CSS book even if you just use it for reference. It's a good way of not always having to search the internet and/or forums.