This dude Eric Prepin or something like that talks about this quite frequently, the whole leaving the body and going to higher planes of existence. He has a whole meditation series out dedicated to teaching others how to do it. it's called the higher balance institute. It's expensive though, that's my only concern with it.
Also, I'm reading a book called "Our Ultimate Reality" which can be found at >
Our Ultimate Reality
The guy who wrote that book talks about these "higher planes". That book is amazing. It should be called "the second half of life you weren't told about". It's really really really good and covers all the bases pretty much.