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The size of the slices are up to you, but they should be sliced thin enough that they're ready to serve. You can slice up the entire ham, or you can do a bit at a time if you're not serving many people at once. The foil will help to keep any moisture released from the ham slices inside the dish, which helps prevent the ham from drying out. The foil should be wrapped around the sides of the dish to prevent any heat from escaping. in the oven. The oven should be set to 275 degrees Fahrenheit (135 degrees Celsius). How long you have to reheat it will depend on how much the ham weighs. You should leave the ham in the oven for 10 minutes for every pound (0.5 kg) it weighs. About halfway through your cooking time, remove the foil from a corner of the baking dish. The slices should still look mostly pink. If you notice them turning white, they're drying out. Add a few tablespoons of water to the dish and put the ham back in the oven.

Summary:
Slice the ham into pieces. Place the ham slices in a shallow baking dish and cover with foil. Reheat the ham Check your ham to make sure it doesn't dry out.