How normal is it for just the husband to have a gf, and the wife not be involved with the husband's gf too?
Totally normal. There is nothing wrong with a poly V, where the two "V-arm" people don't interact much. What for? You aren't dating her. You also don't have to be pals. "Basic polite" is good enough, if you happen to bump into each other in passing, or out in town.
I've only talked to her on the phone when I wanted to make sure this was all on the up and up. She I are a lot alike. We may be friends. I'm not sure... leaving that up to her. I know she isn't keen on me coming to her home and her space, and I'm okay with that. I respect her.
Cool. She doesn't have to be in your spaces either. There is nothing wrong with a parallel V.
How much time is normal to spend with someone in this type of situation, like, each week, to make sure everyone feels wanted and is getting what they are need?
Only YOU can answer that. You might be happy with 1-2 dates a month, or you might want them 1-2x a week. You might want to date other people too, so you have to balance your schedule.
There is no "global normal." YOU decide what you want and what would make you happy to participate. Your BF either makes the cut in your personal standards for what you seek in a partner, or not.
I'm not sure how this relationship will be different from my normal monogamous ones. His friends and family don't know about this lifestyle choice, so part of me feels like a dirty secret. My friends know, but not my family. Do we take pictures together on our dates? Am I allowed to post them? Do I just ask him? Is it weird if I do? What happens when things get worse for his wife? Do I comfort him? Leave him alone?
In one sense, it's no different than a monogamous relationship. It's just dating. You still need to share calendars, talk about safer sex, and all that.
In another sense, you have to deal with extra, different issues. You have to talk to your BF about how open you each want to be about the relationship and the fact this is a poly V. Ask him where his comfort level is, at this time, about things like pictures, posting on social media, telling or meeting friends and family, and so on. You can't be a mind reader.
Maybe being open about it with friends and family is okay, but not at work, because that feels weird.
Additionally, if you already don't like being a secret this early into dating, and this will NEVER change, it might be better to bow out now before you get more attached, because you'd prefer to be more open about your life.
It's okay to be new to polyamory, but you are still the expert on YOU and what you will and will not put up with in a relationship. Your consent to do things, or not, belongs to YOU. Poly doesn't mean good manners fly out the window.
SOMEONE has to be your first poly partner. You don't have to stick with them forever though, just because they were the first. Just like in any kind of dating -- some people will be compatible and some won't. You figure it out through dating. So, get to know each other and ask all the things you want to ask. Speak up for yourself. Do NOT expect him or his wife to have all the answers or to "lead." YOU are responsible for your own self and what you get yourself into. Educate yourself about polyamory.
You could read books, listen to podcasts, read web articles, etc.
Galagirl