codecademy.com is a great free website that provides quality lessons that teach you everything from the basics of HTML to more advanced languages like Java and javascript and a number of others. I think that's a great way to start and see what peaks your interest after that. You can get into SEO work and offer help to websites that aren't hitting the top pages in google searches, or you can utilize squarespace.com and build really nice looking websites for people you meet or if you can think of local businesses that need a new or improved website.