This is not by any means the only way to photograph dolls, this is just how I do it.
First, you got your backdrop. How simple is mine? Mine is a science-fair tri-fold project board covered in white poster board, with a white poster board floor. Not shown in this photo are the pair of TV trays the whole shebang is sitting on. Anything your dolls will show up against-- fabric, paper towels, foamcore board, scrapbook paper, a nice clean wall, a curtain, a printed or painted backdrop-- will work, I just like to work with white or light gray because it cooperates with most other colors. I also like this setup because it folds flat and tucks out of the way easily.
Second, and this is even more important than your backdrop, you need lights. Sunlight is an excellent light, but it's not always reliable-- unless you have a north-facing window, it changes color throughout the day (and even with a north-facing window, it changes color at the end of the day), and indoors you have to contend with things like your windows not being perfectly clear-- mine are green-tinged for energy-saving reasons I do not understand. So whenever possible, I take my photos after dark, using two cheap desk lamps armed with GE Reveal 40-watt light bulbs. GE Reveal brand bulbs show colors beautifully truly-- Ott Lites are the only ones that do it better, and Reveal is a lot cheaper and available in most big box stores-- and goose-neck desk lamps mean you can put the light right where you need it. The lower the wattage the better, though, for three reasons: one, these are going to be pretty close to your dolls, two, these are going to be pretty close to you,
and three, you really don't need SUPER bright light for clear photography right up close. (It's always tempting to use your flash instead of using good lighting, but flash macro photography tends to wash everything out or make your photography subjects look weirdly shiny, or both.)
Third, you need a decent camera-- my own camera is an older Olymups Stylus point-and-shoot. It's pretty good-- 10.1 megapixels, 7x optical zoom, fits easily even in a women's pants pocket-- but I've had it for at least a decade and it's not great.
Features to look for are face detect (great for getting auto-focus in the right place), macro mode, and super-macro mode, which allow the camera to focus clearly on small items right up close to the lens.
Fourth, it helps to understand that the higher the ISO setting, the greater the grain. Low ISO settings have low grain and are meant for bright light and low movement-- which, if you're photographing well-lit dolls, you already have! I try to take all my tiny-things pictures with an ISO of 80, the lowest my camera will let me set it, though sometimes darker-skinned dolls refuse to focus below 200.
Finally, if you're going to try to tell a story with your photos rather than just take product pictures, remember only what's going to be in the shot needs to be part of the story. My dolls look ridiculous from the waist down here because I knew the shot I wanted from this pose was going to be from the waist up at most-- the final image is barely shoulders-and-up. Get in close and on the level with your subjects-- which is good advice for a lot of things you might photograph-- and only use the zoom if you have to.
These two are for sale on eBay here.
Or, for more Tonner dolls (mostly nude, some repainted, re-rooted, or both), check out my items for sale