Tips
Remember that your goal is to create a story with a theme and a mood

 

In the small image to the right  a person who likes sandpipers leaves the sanctuary of their Florida town Naples to visit Little Duck Key only to find it infested with strange birds and a giant sandpiper.
 

Story - I'm never leaving the comfort of  hometown.
Theme - Reluctance to travel away and the bizarre results.
Mood - Fear tempered by bizarre humour.

Process

Preproduction


1)
  assemble ideas about  what you want to portray in the collage
( at this point you might want to do a reality check and assess your resources such as available images etc.)
2) storyboard the idea with pencil and paper ( you don't have to be an artist)
3) begin production ......

Production (click for details)

setting up a new image -
FILE > NEW > 300DPI ~ 11" x 8.5" (landscape/portrait?) ~ RBG
(make sure that your layers and layer styles windows are open and all layers are called layers not background or index)
assemble images-  cut away backgrounds, and render them for colour, saturation, contrast, filtering etc.
layout -  drag images  images to their location on the canvas, size, tilt, skew to suit
layers - arrange images in the layers hierarchy accordingly