If you have access to Power Point you could make one, either about care, how to make money from them, or both.
If you need any help with it I could help you.
I'm not sure if you could make much money off this, but guinea pig poop is like bunny poo and is good for gardens.
I'm not sure if you could really sell it but at least you could save money from not using fertilizer and use their poop instead. You don't even have to compost.
You can litter train them like a rabbit of cat too, which makes it easy to collect their poop.
I don't know a whole lot about guinea pigs, but I do know that the little cages they sell at oetstores are way too small (and over priced!). I recommend using NIC grids to make a DIY setup instead.
You'll also save money on nit using paper bedding. Instead just use fleece (which you can wash).
I have tons of pictures saved if you'd like me to share.