Update Custom Wordpress Checkout - NOT WOOCOMMERCE

I have a Wordpress Multisite Domain. You can view one of Sub Category pages here: [login to view URL] We created custom checkout and product view. THIS IS NOT WOOCOMMERCE. PLEASE DONT APPLY UNLESS YOU HAVE AT LEAST 6+ years experience! I have no time to waste training you. I also expect you to start work NOW, and not leave until completely finished. If you can do that, then read below. AGAIN DO NOT WASTE YOUR TIME OR MINE> I WILL BLOCK YOU SO FAST FOR ASKING DUMB QUESTIONS. The tasks I need done are the following: 1. If user logs in at checkout, menu needs to update to show Log Out instead of Login. (If you test login via menu link, everything works correct, meaning after Login, Log Out shows in menu) 2. When user chooses Register at login, the About Step is being skipped that shows Name, Email, Phone, Ship To option choice, and Site terms checkbox. We need to correct whatever is causing this step to be skipped. (IF you want to see about step page, just click Guest Checkout under login fields) 3. If user chooses Social media buttons to Connect with our site, a new Wordpress user account must be created for them on our server, and then they must proceed to About Step. 4. When Checkout is pressed is on screen, I want to disable Checkout and Clear buttons.