Get a routine for feeding and cleaning (supervised) or you'll end up doing it all yourself, which you might be okay with. I do the night-time bed change and morning feed and "hello".
DD and I share the evening supper feed and the big clean.
Guinea pigs are lovely, chatty,greedy,vunerable little rodents. They aren't athletic (I've never had any luck with my DDs pigs climbing ramps, so we're all on ground level now)
They are tolerant (but don't believe these adverts which say "they never bite" of course they can if provoked. They have those teeth for a reason, but it is rare , and usually if they do bite there's a good reason)
They are messy (especially sows) we have 2 adult sows and an adult neutered boar, all Rescue. They create so much pee/pooh. That food goes in, it comes out 
They thrive on routine, if you are late feeding them, they let you know.
Don't expect too much from them in the beginning. It takes a while but they'll settle. Wrap them in a towel to begin with for security and the inevitable wee.
Are you planning on sows or boars?
And have you decided where to get them?
There are loads of threads on here about food they like, food to avoid.
There is no Holy Grail of Bedding you will find what suits you and your pigs.
Read up on their health issues. They don't cope with damp or draughts or direct sun.
They cannot vomit. There are several garden plants (buttercups,daisies,bulbs) that will poison them.
They need protecting from predators if they are outside. Foxes,cats,dogs,birds of prey will all try to pick them off if they can.
Enjoy them and we want 'pigtures' 