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About proxy list
Proxy type influences the way you can use it.

There is 4 main types of proxy:
HTTP — allows to visit web-sites and download files from HTTP.
HTTPS — also called SSL proxies. With these proxies you can view HTTP and HTTPS sites.With special software they may be used with any protocol like SOCKS proxies.
Socks 4 — can be used with any TCP/IP protocol with any destination address and port..
Socks 5 — you may also use UDP protocol, make DNS requests, und use BIND function for port forwarding.
About anonymity of proxy:
No anonymity: remote host knows your IP and knows you are using proxy.
Low anonymity: remote host does not know your IP, but it knows you are using proxy.
Medium anonymity: remote host knows you are using proxy, and thinks it knows your IP, but this is not yours (this is usually a multihomed proxy which shows its inbound interface as REMOTE_ADDR for a target host).
High anonymity: remote host does not know your IP and has no direct proof of proxy usage (proxy-connection family header strings). If such hosts do not send additional header strings it may be considered as high-anonymous. If a high-anonymous proxy supports keep-alive you can consider it to be extremely-anonymous. However, such a host is highly possible to be a honey-pot.