before you even start thinking about layout and colour combinations its vital that you get a clear idea in your head of what is required of this task.
Answer the following questions on your blog before you begin the design process
What is the websites purpose?
Who are the audience of the website?
What does the website have to communicate?
What will the personality of the website be? (e.g formal, informal or fun if for a primary school)
Once you have answered those questions you can begin storyboarding your website!
A website storyboard is very much like a flow diagram, Ive included an example of
what it should look like,
here is an example from a website I designed
http://www.farndonfields.org/

You only need to plan out 4 pages including the homepage, notice how the storyboard includes a quick list of what each page has on it such as illustrations, photograph slideshows etc.., you may need to look at a few actual school websites to give yourself a clear idea.
So your second task is to make your Website storyboard.Dont worry about colour usage and design too much yet, we are sorting them out in the next few lessons!