In order to properly train your whore, you must drive home total resignation. Strip the self of choice. The best way to do that is to tie her up to a bed and invite over any man you can find. Line them up starting in the bedroom trailing out down the hallway, and have each one fuck her until they cum in her mouth. One after the other for hours on end. Seconds, if they want it.
This reinforces a multitude of future behaviors in your whore, but most importantly, that she is to be used, anywhere, any time, by anyone you say.