I did not have any C Compiler so I can't use Plugins, where I can find compiled plugins.

Thanks

Hello,
Usually, you don't need to compile plugins, they come as dll or similar files that you put near the Olly root folder (or not), then you just have to specify the folder location where the plugins are to Olly (option menu).
And btw. if you are looking for a C compiler you can find many on the internet: Borland, Microsoft, GNU.
Regards.