Just jump on a web development software and fiddle around, whatever you want to achieve you will do and learn from google, if not plenty of books to aid and reference you, web design for dummies is a good intro.
Me and my nephew started doing websites not long ago and it is hard work, there's html, java, jquery, php.... but its part of the learning curve, especially when you come to test it on browsers, in the end we decided everyone who uses IE can f*ck themselves

Also social media helps alot, we have started doing a website for my brothers MMA school that he has setup in his spare time and we have a twitter, youtube and fb as the social media's again this is a learning curve in its own right as I had to learn how to actually use a DSLR camera for indoors, first photography night was awful not to my brothers amusement, second time round we got some good picture. Now we have done a pretty awful youtube video as it was filmed on a potato

But its part of the fun and keeps us going.
If you set your mind to it, the sky's your limits for everything else just hit it with a hammer or a brick.