1. Having a routine is just largely about choosing days/ times that work around your schedule. Mine changes depending on day/ month/ weather and works around the three types of animals I have.
Generally my daily weekday routine consists of: wake up in the morning and change litter boxes, refill water/ food if needed. Leave for college. When I get home change litter boxes again. If the weather is good put them out in their run for a couple of hours. Around 8ish after walking my dog, I feed them fresh food and change litter boxes, do a poo pick up and refill hay rack (which is where I put the more expensive hay once a day rather than just in the litter box), dry food and water bottles.
Getting them out depends on what time I have but generally between the second and third litter box changes they have some out time if they don't go in their run. When I had a long haired Guninea pig I would brush her hair every other day after doing the evening bits but I've only really got abbys and a teddy now so grooming isn't really needed.
Every five to seven days I clean their cage. Every couple of weeks I cut nails (mainly when I notice them getting longer) and every couple of months I'll bath them (generally once every 3/4 months though it does depend on a few factors). These two things I don't really have a specific day for as it does depend on what the piggies have been doing to get dirty/ keep nails short. Every Saturday I weigh them and record their weights and they get a health check a couple times a week- normally when I have someone out and realise I haven't done it in a couple of days.
I believe that is pretty much my Guinea pig routine- may have missed something out but I'm not sure.
2.Cage liners depend on the seller- generally it is a piece of wadding (or like a bed liner) between two sheets of fleece and then sewn together. Prices vary depending on the quality you go for and the size of your cage. I don't really have a clue about prices but if you go to the for sale section there are a few people who sell them and should be able to quote you for one.
3. This is dependant on the girls really- generally it is one of the easier bondings to do as boys/ girls do naturally like each other's company for reproductive reasons. I have (well had) a very easy going group so sticking new members in didn't really bother anyone and the same went when I bonded my girls with my neutered boar. For me it was as easy as sticking them in their new cage together and they were fine, I was fortunate though as I was playing with two babies (one of which was the boy) and two adults and the dominant female happily kept her leader position for a good couple of months off the little boy so no arguements occurred until a couple of months later. Personalities play a big role though if your girls are happy for him to take over, or he is happy to let one of them be in charge it should be relatively smooth.vJust follow the general rules of introducing on neutral ground and taking slow, meeting outside the cage on a number of occasion and as long as this all goes fine slowly try them in the cage together. Make sure you've read up on the good and bad signs to be looking for and take it on your own pace.
Hope that answers/ gives you,an idea on your questions
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