I'm not a complete beginner to c++, i do know the language fairly well. I want to make a retro looking 3d game with it, and i'm not sure how to combine the language with an engine. I want to use an engine like id Tech 1 engine or id Tech 2 engine, i'm not trying to make the game look amazing graphics, I want to make it look old-school.
Could someone tell me what I would need to do to make a 3d RPG using c++? For example, one like Elder Scrolls Arena. Or if you don't know what that is, one that looks like Doom.
Download the engine SDK and look through the documentation - if you know C++ well as you say then learning to initialise the engine etc. shouldn't be too much of a problem.