Your first step is to find a topic or theme to work with then you need to find 10 images of the same genre to recreate in Photoshop.
It could be 'a day in the life of........', great food ideas, travel, places, landscapes, it's your choice.
The images you download then need to be 'recreated' using Photoshop.
Ensure they are 'clean' images and are 1280 px wide or higher. (Do not use any poor quality images). Choose your topic theme carefully. For possible image ideas go to RMWebed and look at the photo galleries.