I was really into this in 1977, I read every book there was on it, back then resources were
very few on the subject.
I had already been doing hatha yoga for many years and that involves meditating which seemed
to help as well but the thing that helped the most was lucid dreaming, something I would suggest
to anyone to learn first that was going to work on OBE's.
It took a year of daily/nightly practice before it happened for me, that one time and that was it!
I still have lucid dreams, something that gets better with time I guess.
I have found 'Binaural Beats & Isochronic Tones' to be very helpful as well,
the info and 'tones' are limitless on you tube, wish I had all the resources I have now back in the 70's!
If you're not familiar with these this site is good for a start;
The N.I.T.E. Post: lucid dreaming
As I said the resources are limitless!
It just takes time, practice, Patience and a strong intention!