Well done for confessing - I wish I'd had the awareness and courage to do so.
Equally there are two major mistakes I made from here in out which I'll share here in the hope you don't do this same. These two things were the most damaging to our R and may turn out yet to be deal breakers for my BH.
1) Be honest. NO trickle truth. Tell her everything, more than she asks for. All the scummy horrid details no matter how much you see it tear her heart apart. NOT telling her will destroy her more every day. If she doesn't want to hear it, respect that, but I'd recommend you write it all down and put it in a sealed envelope or box for her to open in her own time. That way you've provided everything while it's fresh and you've completely removed the ability to say "I don't remember or I don't know" a BS loathed pair of phrases.
If you seal this stuff up but give it to her, you can't back out and change your mind. You can't withhold anything, give her access to phone accounts, email, social media, etc etc. Think of all the stuff you've used/may remind your BW or the OW - the blow up bed - trash it; get new linen anyway - make a fresh start. She'll trigger every time she goes near the kids room I'll bet, can you switch them into another room? Or suggest something to help - even letting her know, you're aware will go a long way.
If you want to nip out to the shop to get her something, tell her. Take her with or leave your phone - or take her phone. whatever it takes to reassure her.
No unexpected surprises or actions. Don't disappear anywhere, even to surprise her nicely. Now is not the time to surprise her. Be early or on time. Whatever you do don't be late. Anywhere. If you are definitely late, ring her and tell her. Put a GPS tracker on your phone, even if she says she doesn't want it.
Install software to download your texts, put a key logger on your computer - give her access to whatever you have - especially if she says she doesn't want it.
Be consistent and don't lie or minimise anything. This is such a big deal for you both from this minute on. How you deal with this stuff will pave the way into or out of R.
2) The NC letter.
Do NOT do the NC unless you are 100% committed to GOING NC. My stbxWH has written NC texts to a couple of his OW (don't ask) and it turned out that he did it just for "sport"....because I *made* him.
If you are going to do the NC text/letter....don't do it unless you MEAN it. And if you aren't willing to make that commitment to your BW, then be honest about it.
I agree with this. I did this. I avoided writing and NC letter until it was clear my BH wasn't letting this go. I did this because mentally I didn't want NC. I wanted a safety net. I wasn't safe to R with at that time.
Eventually I wrote one. Then we posted it together. Then the next day I rang the OM to tell him it was on the way and to trash it without opening it. Low huh? This was possibly one of the biggest set backs in our R.
Finally, I started to wake up. I wrote and NC email in front of my BH and he was happy with it so I hit send. Then I committed a huge, monumental badness. I wrote another one. A private one. The next day I sent a card, also with my intention of ensuring MC but flowery and personal. Emotional. All the things you should never do and say I did. I thought it was more believable coming from me.
All I did with that was destroy my BS totally. When he found out (months later) we went back to square one and I lost all the hard work I was trying to put in. To this day he has not been able to forgive this. When all was said and done, I chose the AP over my BS. I chose to empathise with the AP's feelings and prioritise care of the AP over my BS. I stabbed a knife through my BS's heart again and a nail in my coffin. I can't take back that stupid "NC" letter, but wish I could.
I agree with the above - don't write it unless you mean it. The trauma I put LonelyHusband through on top of the A crap by making failed NC letters was unbearable. But, and it's a big but, it's a good idea to get your head around that NC letter and why it's so important to the BS, and you, real quick. Some BS's dont' want/need one and the feeling is that it's just more contact. They don't deserve to have an ending for the damage they've done, and they want you, the ws having no more contact, even to tell the ap no more contact.
Most BS's find it a requirement. If you can and know you mean it, write the bear bones of one and give it to your WW. Ask her if she wants you to send it. But if you do STICK TO IT.
Good luck Noah, let us know how you're doing. Remember to take care of yourself as well as her.