What happens next?

How to introduce a new guinea pig to a community cage
Be sure the cage is the right size.
The cage needs to be large enough to handle the animals and equipment. This includes the guinea pigs, hideaways, food bowls, water bottles or bowls, bedding, treats, and any extra items for the pigs to play with.
This also includes accounting for the right dimensions for the cage to fit in the room or on the platform you plan on setting up with. Have a tape measure and ways to mark off measurements such as tape or a sharpie handy.