It's funny how many people on here just jumped on the OP for being a fake bullshitter when we he was clearly sincere LOL
IMO this is one of the best questions in the history of this forum. I know the OP asked about where, but too many men just don't properly learn the "how" of sex, porn and social media just messed everyone's expectations (including me!)
I actually don't know where you would go to "learn" something like this, I imagine most folks in this forum just perfected it by trial and error by visiting escorts and MPs. Which isn't a terrible way, but like luv said there's more to it (like breathing exercises & muscle control).
Just wing it and observe. Since you asked in an MP forum, my advice is to take a trip to Premier. Many of the ladies there offer FS and aim to please, just make sure to see the well-reviewed ones. Just let her take control and don't be afraid to ask