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@rodabod
This^.
Sheldon Brown is the best website in my opinion for researching technical bike articles. I sometimes just Google a term and add "sheldon" to get direct links.
Once you determine if you require a screw-on freewheel, or a cassette, you will then need to measure the gap between where the rear wheel attaches on your frame. Shoudl be roughly either 120mm, 126mm, 130mm or 135mm. This will determine how many gears you can fit!