@Jen I'm kind of dreading being hooked up with a parents group (formerly known as mother's group) because I'm scared of the judgey people.
I was very sceptical but have been so lucky with my group of friends. It's three years on and we're still friends. The key for us was that we all supported (still do) each other, even though we have different views. We don't try and push our own view and always own what we do (e.g. one of my friends had coslept from day one and still does. She w my back to full time work at 4 months and has always found that the cosleeping has helped to maintain a close relationship with her son. Not my thing but I respect that it's what works for her and her family).
I actually found it really good to have a support network when I went back to work. We all were back at least 4 days per week before our kids were one. It's tough to do and we were able to lean on each other as we all understood.
I'd say a group chat is definitely the way to go. We set up a WhatsApp group after week two and have used it nearly every day since!