Yes, it is overwhelming at first, but it gets easier. I suggest that you go to Edgepark's website and request a catalog for starters.
Next, call the manufacturers that are listed in the catalog. Coloplast, Convatec, and Hollister all have wonderfully helpful people that you can call. They will explain things and send you samples. You can get their phone numbers by Googling them.
Convatec actually has nurses that you can talk to.
Hope that helps. Maybe if I get time I can round up some phone numbers for you.