There is loads of Aids that you can get to help you with this.
For Example a nappy mat basicaly its like a mat but its like a nappy :P
Just place it some where were you want your pup to do its doings, probably under a window so it doesnt stink out.
And basically when you think he needs to just pop him on it and let him do his buisness.
Then after a while start trying to direct him to it instead of putting him on it.
Theres a start then its trying to wein him off it and letting you know he wants to go.
My dog follows me around when she wants to go out.
Hope that bit of info helped
