What were you asking about?
Sounds like
travel services from what I am reading. Was this a trip to Playa del Carmen?
If it's decoding travel packages from a dive shop, it's probably best to stick with one that sponsors or hosts a
local dive club. Go to a few meetings, listen to what they are saying, then decide if you want to throw down and spend a week with these people.
Buying a trip from a dive shop, just one that they are selling and not sending a group out on to? Probably a bad idea. A store supplied
trip leader can't be relied upon to do everything for you or address every complaint, but they can go a long way in telling you "where to stand for the bus", etc. they may well be sending a group for a warm water open water dive segment of their certification. Tag along?
Until you are ready for planning and booking your own adventures, might want to go with a group. I have hooked up with dive clubs 900 miles away (Houston's
Oceanic Ventures, Inc.), here's a small sample nationally:
Dive Guide Scuba Diving Clubs Diveguide.com