I'm pretty new at this yet, so I'm asking if using images is something very... advanced. I would like know that because I wish start create games (very simple ones, of course). Thanks.
It depends on the library you're using. There are many libraries for C/C++ which make using images relatively painless and easy to learn.
SDL (http://www.libsdl.org/) makes drawing images to the screen pretty painless. It's easy to set up and can load .bmp files out of the box -- and there's a seperate image library (SDL_image I think -- I don't actually use that one) which supports loading of other types of images (png/jpg/etc).
For games, I'd definately recommend SDL as a starting point... as it's very easy to pick up and learn.