Help.

[97Hope]

How do I handle what's left of her belongings in the house" - it's minor things, like a stereo, some cups, a chair and a few boxes.

Must you do something with them?
I would suggest taking a deep breath (or 10!) and try to focus on what you must do. A lot of times in the beginning you can wear yourself out thinking that you need to "do something!" whether it's keepsakes or stereos.

If/when she asks about them, you can decide. If you need them out of sight, pack them up nicely and put them in a closet or something. But if you don't need to do anything, don't. Conserve your energy for your GAL and your little one.

We share a child, what dynamics are helpful for me to know?

Be the best parent you possibly can. Engage with her and focus solely on her. Don't send pics to your W. Don't text funny things she does, just enjoy her and love her up. She needs you to be a rock.

We share a child together and see each other sometimes 5-6 times a week. How do I manage those visits? Both my inner world and interacting with her?

Breath before the visit. Don't hug/kiss or gush. Just be friendly and brief with the exchanges. Pretend you are meeting your accountant. If you use these trade offs as a way to chat/inquire etc. W will be put off.
Also - look amazing but don't go crazy lol

If she texts me pictures of P how do I handle that?

You can say thank you or not. If she asks a question, answer, but give her SPACE. Let her come to you, but do not, under any circumstances - reach out to her.

What do I do with the letters and keep sakes?

See above #1. I put mine in a box until I was ready to deal with them. They are in storage. I might never get them out. But do NOT go through them right now. No letters, photos etc. Right now focus on today and only today. Will help with detaching.

I am starting to get the message that I too need to know, feel and act like it's done and over.

Yes. You need to realize that she is done. That might change, but right now, she is done (according to her). So you act as if. As if you are fine no matter what. As if you are moving forward with your life. As if you have a life. (If you don't, get one. (smile) GAL (get a life) is key!

I ordered the book and started reading Sandy's rules.

This will help you a great deal. Also read all of the newcomers links that Job posted and read here.

Reading your posts reminds me of where I was in the early days. It feels overwhelming, so focus on what you MUST do. Try not to think too far out in the future.

You will get through this.