questionk

Hi, I already have a UTR from previous work, but I deactivated it years ago after stopping this work. I am now starting a new business and need to reregister as self employed with my business name. I completed the CWF1 form for my UTR but have not received any confirmation by email or see anything different in my account. How will I know if this has been successful? In addition, I have a Personal Account and a Business Account on different Government Gateways, does it matter which Gateway I was signed in on when I completed the CWF1 form? Lastly, as a sole trader, do I need to set up anything in the Business Tax account or just in Personal Tax? Thank you for your help in advance.