http://www.cplusplus.com/faq/intro/#getting-started
You'll also want to read through some tutorials. Ours is pretty easy reading:
http://www.cplusplus.com/doc/tutorial/
Next, figure out what it is you want to program, and start learning everything you can about it, and writing stuff to make it happen.
Just be realistic -- you aren't going to write anything truly amazing the first thing. But it is reasonable to consider doing cool stuff. The first programs I wrote were things like:
- hangman, complete with ASCII art (GW-BASIC)
- game image editor (Turbo Pascal 4)
- (S)VGA graphics library [with particular attention to X-mode and VESA SVGA powers) (C)
- Screensavers (various languages)
- breakout clone (Turbo Pascal 4 with BGI graphics)
- DOS environment control programs (C, playing with stuff at the console)
- ASCII graphics editor / display program (TP4?)
- DOS game menu for launching all my video games (TP4?)
- various abortive ninja-turtles and D&D style games (none of which ever came to anything, but they taught me a lot)
Of course, that was a long time ago. But the basic principle is still the same: Find something you want to write, and do it.
Hope this helps.