The choice of business structure is your decision. Each needs to be considered to see what will work best for your business.
For information on sole traders, partnerships, limited liability partnerships and limited companies, this blog contains lots of useful information. Choosing the right business structure – Companies House (blog.gov.uk)
To understand setting up a social enterprise Setting up a social enterprise – GOV.UK (www.gov.uk)
For the formation of charity Set up a charity – GOV.UK (www.gov.uk)
To establish a community interest company Community interest companies: forms and step-by-step guides – GOV.UK (www.gov.uk)