Getting Started + compiling

Hi. I want to make a gimp plugin in C/C++

I assume this is possible to do in visual studio (I use windows)
I downloaded some sources of plugins to test, but so far I am unable to compile them.

I have downloaded gimp's source and linked it to the project, and I also got GTK and linked the include files.

When I try to compile I get stuff like:
unresolved external symbol _gimp_main referenced in function _WinMain@16

Also, what is gimptool? I keep reading about it, however I can't seem to find it anywhere.