Welcome @sunshine7 Sorry that you're here but glad you found us. You will know more about treatment once the surgery is completed as the node status will come back in the path report and that may determine the next stage. Once that's known, your surgeon will do the co-ordinating of treatment with onc and radiation. I had the hard copy "My Journey" but I'm pretty sure you can sign up for the online one on the home page for this website. As for a bc nurse - I've no idea because I never really had one.
Your GP should be able to go through the path report with you in to help you understand it but is unlikely to be involved much in your treatment (although obviously it's helpful that the GP knows what's going on - mine gets included in any test results so that he is aware of any changes).
Feeling overwhelmed is perfectly natural and most of us have been there. If you have someone close to you who you trust to stay calm and clear-headed, it's good to take that person to your appointments if you can as so much is hard to take in.