beginner wanting some information in programming opengl

hi guys id like some info if anyone can help point me in the right direction.

i have a very very basic knowlege of c++, so i dont know that much, about much programming , so im just trying to grasp this.

c++ is the coding language i will be using, and open gl would be the api ?, is this right.

so all in i need to learn c++ and then the opengl api to be able to use it ?

i am just starting out and would like to make a small game in open gl, so it can be multi platform. Im not over ambitious i just want to make a wee guy run about and shoot badly ai programmed bad guys, kinda like a cheap doom or quake clone.

so if anyone could give me any information that would be awsome, thanks for any help that will be given