Hi Savanna,
I do photography a lot of artwork. Fine paintings are sold by sending large format (4x5 and 8x10) transparencies to the client. The standard film for photographing artwork is Kodak's EPY which is a tungsten balanced film. I don't know the contrast of EPN but EPY is low enough in contrast to work well with paintings. Tungsten lights are cheaper than strobes and the only other choice is what Stan L-B recomended which also works well with daylight film. For paintings that large I would recommend a at least 4 and probably 6 lights. Buy sheats of polarizer filters from Edmund Scientific (one sheat will filter two lights when cut in half). Polarize both the lights and the lens in a darkened room. Find the biggest and heavyest tripod you can afford. They are probably cheap on Ebay because unless your are only in the studio everyone else wants the lightest they can get away with - Magestic or Stanford and Davis might be good choices. As for film size usually bigger is better but I don't have much experience with scanning so place more weight on other answers.
Good Luck
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