1 : You need a computer
2 : You need an Operating System ( Win-xx / *nix )
3 : You need a FTP Server program
4 : You need a public accessible IP adress ( not 10.x.x.x / 192.168.x.x )
5 : Your connection to Internet *should* be fast and stable.
6 : You will need a "friendly" ISP, or know how to hide your server.
The most important thing is 4 and 6.
Let me know if you need more input's
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edited after the import, to improve readability.