External RCS

I'm trying to make an RCS, although I don't know where to start. I've tried looking at source codes but they don't make sense to me. I don't want one connected to an aimbot, I just want RCS alone. I know a lot of people will be really toxic about me asking this question, but could someone show me an example or give me some pointers on how to make an RCS externally? Like I said I've tried looking at other sources but they are either internal, attached with an aimbot or just don't make sense. Thank you in advance.

Check this source out from a good friend of mine, it explains everything.
http://www.mpgh.net/forum/showthread.php?t=1075120