Make sure anything you give them to play with (and chew. They will chew) has no staples, plastic or sticky tape.
Any of those will cause damage or blockage to their insides.
I bought Hop Inn tunnels for our guineas in their run.They have toggles to fasten to another tunnel or cube which thankfully they haven't chewed off.
Cardboard boxes have the advantage that you can just throw them out when they get manky.
Primark paper bags cut the handles off are good. Our lardy boar got stuck in the handle and was well judgey.
The guineas I had as a child would sneak up on shoes and take the laces - chewed off at the eyelet. I have a No Shoes House Ha guineas, denied.
GP1 was sitting on the table , looking up at me, I lifted him onto my shoulder and the little bugger got my earring (silver with a cz stud) out of my ear.Luckily, I got a hold of the post, still in his mouth , and called for DD to grab him while I removed it. This was in the week after GP2 died, I thought "No, I cannot lose another piggie
"
He lost another of his 9 Lives, didn't faze him.
When you have things in place, we'll give you some Bonding Tips.
i used a paddling pool, brand new and neutral.
wash them with the same shampoo (if you get a mini-pig you need to be careful what you use.)
food
- space between the bowls too so they don't invade each others space
the cage/hutch will need to be deep cleaned to make it smell neutral so you aren't putting the new one into the other ones domain.
I'll think of some more and come back