Here are some examples of mood boards for you to look at, and get some ideas, you need to look around you and start collecting things,
pictures, small objects, magazines, taking photos, anything and everything, pick a theme, or just a colour to begin with,
collect them into a bag, then place them onto the floor and start arranging them, to get some ideas of a layout.
Scroll down the page, firstly are the two boards from school and watch the animation of how the "blue & sea" mood board was assembled.
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Here is a link to 40 ways to make great mood boards
http://www.creativebloq.com/graphic-design/mood-boards-812470
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