Draw your rough sketch on a piece of A4 paper with it positioned sideways (landscape).
This can be very rough but it must have enough information to tell you where to place items on the website page.

The users eye will first look at the top left then work down the screen scanning for information across the screen. This works just like reading a magazine page with text and pictures. And that is how you place items on your website page.

This layout [click on the picture to see a larger image]…

has a header across the top with a menu index down the left side and main content to the right with a footer along the bottom. This appears to be the most common layout used on the World Wide Web.

Just have a go – You may not get the hang of it straight away but with a few tries you should have the idea.