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@The_Seldom_Killer
Yes, you can just stick a fixed cog (although I found the threading a little tight and produced a few tailings). Yes you will need a locking ring unless you like adding a little risk to your ride (This is pretty much universal for threaded cog usage).
As for size, well it certainly does matter. Alas it is done to the rider. Just how much to you think you can take. With the factory chainring, I would advise a 16 or a 17 unless you live around a lot of hills then go for 18. Best thing to do is to have a spin on the factory freewheel and see how it feels.