Here you'll find links to learning and using Photoshop. Some will be videos, others you will have to read.
To start, here are the first steps for learning editing in photoshop:
importing photos
Cropping
Adjusting levels
Using curves
Removing any distractions, eye snags or improving a busy backgrounds.
Adding your name
Adding a high pass filter to improve overall sharpness.
Save your photo as a jpg. Ensure you keep your .psd file. We will be returning to these photos to do more editing later.
All your photos that you hand in should have this basic editing.
Inserting a photo into an existing image.