I am leasing a server and want to convert it to a proxy server so that I can use the ips as proxies in software I plan to run.

How do I do that?

Thanks in advance.

Depends on whether you want HTTP (e.g. Squid) proxies or SOCKS.

If SOCKS, then have a look at Turn any Linux computer into SOCKS5 proxy in one command - good coders code, great reuse

Are you sure you can get enough IPs to use? IPs are hard to come by

I can do it.