Welcome to the forums! I replied in your other thread, but wanted to chime in on a couple of items in your post above:
- First and foremost, I would get your initial Open Water (OW) certification as soon as possible and see how you like it. Some folks end up having trouble equalizing their ears or sinuses, some folks feel claustrophobic, some get vertigo, etc. So, getting your first cert will let you know if you really want to go further. It usually only takes about 2 weekends to get your OW cert.
- You mention a PADI cert, but really any of the major certification agencies (PADI, SSI, SDI, NAUI, etc.) can be fine (I say this as someone with mostly PADI certs, but some from other agencies). It's really more about the instructor and the dive shop more than the agency. And it's fine to mix and match, for example: SSI Open Water, NAUI Advanced Open Water, PADI Rescue Diver, etc. Your OW cert agency will not prevent you from getting a PADI Divemaster cert if that's what you want.
- Both of the above lead me to say: I'd consider going ahead and getting your OW cert from your local scuba shop this summer. From a quick Google search it looks like you have a dive shop in Arvada that has good reviews on Google and has classes every month. Looks like they are an SSI shop, but that is perfectly fine. I'd try to get certified this summer, because freshwater lakes and quarries can get pretty cold after summer is over. If you get certified there you'll have some local people to dive with and learn from, perhaps even take trips with. You can get your OW locally and still dive anywhere in the world. While lake and quarry diving is not clear blue water with pretty fish, it can be great for training and still fun also (I still dive quarries in the summers).
Hope this helps!
Edit: If you really want PADI, looks like these folks are near you and have classes starting this weekend and the next:
PADI Open Water Diver With any dive shop, make sure to confirm whether their pricing is just classroom and pool work, or if includes your 4 open water checkout dives (which can be lake, quarry, ocean, etc.).