Ok, well i been learning c++ on and off for a while now and i have created a particle engine (actually just followed a tutorial but i understood it, lol) and im just wondering.. how do i organize it? should i use oop and multiple files and if so how should i handle it? Also, i have been learning opengl but is it a better idea to go the m$ directx route?

You seem to only be concentrating on the graphical aspects of a game. Bad idea. Theres a lot more than just graphics involved.

Graphics
Sound
Input
AI
Logic
Resource Handlers
And a whole lot more..

Try and keep it OO, learn GL (nice easy syntax)

Keep your first game short, sweet, and not too ambitious.

well im really just wondering how i should organize it to keep the game and the windows stuff seperate.. would i just put them in differnt files and if so how would i make the instance for my game? soy confundido muy (i am very confused)