If your serious about this, another route to go might be to ask if anyone in your area is interested, form a private club and explore things together. Get advice (if you can) from other groups (especially the more serious ones) but start out slow and do your preparation work.
This can be true for almost any sort of metaphysical study, from ghost busting to tarot reading. If you can't find people already experienced in it to join, then form an group of interested newbies and carefully explore things together. Start safe, or with a really good book/lesson plan on the subject; be wise and don't try taking on the scene of a local gruesome murder for your first experiment.
If I was going to do this (and I have no plans at this time) I would look at various forms of voice recording and perhaps start there. That's a hobby that can get pretty expensive if you get fancy, but was started in the old days by people using just tape players in graveyards and old buildings.
But whatever you (or your group does) please read a good book about and practice basic psychic protection techniques first. Trust me, your going to need them if you do this sort of work, even if you have the best intentions in the world; your likely to "attract" somethings that won't appreciate your efforts.