I’m currently in the process of incorporating a company and www.businesslink.gov.uk is my friend (now gone away but there is https://www.gov.uk/browse/business), especially the “Business start-up organiser” which is the ultimate “to do” list of things that need to be done. However, I found the site was annoying in that it kept logging me out if I went away for 5 minutes and the login procedure is frustrating because it asks you for a long number and doesn’t remember it. To force Firefox to remember the login details you need to edit a settings file, nsLoginManager.js:
I’m going to add this to the list of “Essential things to do immediately after installing an Operating system” as it saves so much time.