Cavy Cages has helped me a lot. This was the first website that I went on.
Then:
1 guinea pig from Petsmart in store bought cage
3 teaspoons of hay a week on the floor of the cage
2 Tablespoons of fruit and veggies a day
Lots of treats
Had him out 24/7
Super small cage
Now:
Got new guinea pig
Made sure it was in quarantine
1st guinea pig died (don't know why)
1 cup of fruits and veggies a day
Handfuls of hay on the floor of the cage
Balanced amount of treats
Handle them less
Future:
Get a hay rack
Get a new guinea pig from a shelter
Get a cat and keep the guinea pig in a seperate room
Become a vegetarian