Before paying for anything, check out PianoJohn on YouTube

https://www.youtube.com/user/pianojohn113

I think it will be just what you are looking for (as long as you don't mind mostly Beatles, Elton John and Billy Joel). With what you already know, you should get a quick understanding of how to "transition" to a "piano player as opposed to a music reader".

His instruction is intelligent and easy to follow. And you can be playing the songs in his "lessons" in no time. And you learn as you go....

floyd