Start by drawing. Pen on a napkin, crayons on paper, or finger paint on the walls. Once you do something that gets you started on the design process, it will snowball from there.
I agree that drawing is a great start. If you still don’t have any ideas, just look at other websites/projects to get some ideas (but don’t look at the fancy ones… I did that and it made me feel like I’m far behind everyone else…).
Then, just start to add the HTML pieces and it would be easier from there.