1. This page size is exactly the same size as the Projector resolution 1400 x 1050 px.
You can insert your 3 images as they are by going to Insert > Picture, or draw an oval, a hexagon etc. and fill it with the image.
To fill a shape with an image:- Drag out the shape, then Right click > Format Shape > Picture or Texture Fill > Insert from File.
You can also play around with the edges: shadows, glow etc. – all found in the same place.
To colour the background:- Right Click (on the background!) > Format background and decide on colour, texture etc.
If your version of PowerPoint will not let you Save as – JPEG (instead of a PowerPoint Presentation) it to me as an attachment, and I will convert it to a JPEG for you. If you need more help, just ask! Good luck, Janet My is:-