You can try doing a search on top menu bar. There are so many posts regarding litter training. Pigs poop wherever they want to poop, there is no specific way to training them. Alot of them tend to poop in corners, while others poop under there hideys, other times they poop while they are eating in the kitchen area. If they poop in the corners, you can put a littler box there with some carefresh to help distinguish that spot is the pooping area. If they poop while they are eating, you can make a so called kitchen area filled with carefresh so it's easier to clean.
You have to have some sort of bedding down because they have sensitive feet and you wouldnt want them walking around in there pee and poop even if they get the hang of the litter box. Plus pigs dont always sleep in the beds, they sleep everywhere. Besides just having beds, you need some hidey's, pigloos, you can add a piece of fabric to the corner of the cage to make it seem like a tent, there are all different types of hideys. You can also check out the photo gallery for more options. They also need some toys to keep themselves entertained. You can try paper towel rolls empty or cut down the middle and fill it with hay, bird toys, stuffed animals they like sleeping with (mine do at least), cat ball ( just make sure to keep an eye out on the bell inside, or try to get some that don't have a ball). Stay away from treat sticks, the treats that they sell at the pet stores like yoguart treats, hay tumblers ( they can get there heads stuck inside), and don't get a harness or leash for him/her.
Fleece is a nice touch to the cage, you can read all about fleece in the bedding section. Plus it's fun to use different colors, patterns to make the cage stand out. You will also see a difference in the way your pig is acting, as well as having a C&C cage for them. They love it!
Also, are you getting 1 or 2 pigs? Getting 2 will give the 1 a companion so it isnt lonely during the day.
Hope this all helps