Welcome. Glad you're here. Yes, people can offer some recommendations on gear, but will need to know a bit more.
1.) Do you plan to dive locally, such as Great Lakes diving, and/or in really cold water? That could have a bearing on regulator recommendation. Also, regulators require periodic servicing, so you'll probably want one a nearby dive shop will service.
2.) The BCDs, there's the standard 'jacket-style' many people are familiar with, the back-inflate that can make horizontal trim at depth easier but could in theory pitch you forward a bit at the surface, and the BP/W (back plate/wing) setup that's similar in function but highly customizable, requiring you to make a range of choices.
The more people know about what kind of diving you intend to do, the more easily they can recommend things. Some may recommend holding off on big purchases until you do a few trips using rental gear, so if you lose interest you won't be selling expensive gear on Craig's List or similar at a big loss to yourself.