120 and 220 differ in two respects - 220 has twice the number of frames, but also only has a backing paper partway on each end, not thoughout the entire roll, like 120. Having said that, NOT all MF cameras will take a 220 roll. Pentax 6x7 just needs to have a switch moved on the camera so that it will know it is 220. Other cameras, such as the mamiya 645, needs a 220 insert. Unless a camera has a 220 switch, a 220 back, or a 220 insert, it will "think" it is 120, and the number of exposures will reflect that. In addition, you can't use 220 in a camera that uses a red window to read the exposure number, because there is no backing paper partway on the rill, and the film will be exposed.
Generally, unless you are doing studio work or in a portrait setting, you are unlikely to use 220 -- it is available in fewer emulsion variants than 120. For most purposes, 120 will be all that you will need, and with the cutting back on some types of films, I would not be too surprised if 220 is available for only a limited number of years. 120, though, should be around for quite some time.
If you are exploring MF, try the sqaure format, as a twins lens reflex can be had fairly cheaply - a good Yashica TLR, Rolleiflex, mamyia C33 or C220, and of course, new cameras, such as the Seagulls are pretty cheap. If you want something with more bells and whistles, a Mamyia 645E is a good system with lots of lenses available, nice viewfinder, and aperture priority amd manual metering. Good luck, and have fun!
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