How do you create a winamp plugin? I have the source from one, but i can't compile it because i get an error (I can't tell you what it says because I'm not writing from my computer). If you can help, please tell me what should i read or send me an example (count that I am a newbie).
Finnaly if you think that my english is bad, please escuse me.

I forgot to tell you that the only programming language I know is C/C++.

There's plenty of documentation on a certain website. Google for the obvious, and be enlightened.

I've been searching the web for almost a week and I only came up with more sources that have erorrs. One of them almost works. I got the dll but winamp doesn't recognize it.

Download some plugins, look in the readme for email addresses of the authors, email them questions.

Googling for "winamp plugins", the first result is nullsoft's official winamp plugins page. At the top of that page is a tab labled "develop", wherein you can find official plugin development documetation.