Choosing the right legal structure:
Sole traders, partnerships, private limited companies and public limited companies.
You need to know definitions, advantages and disadvantages of each type of legal structure.
You could start here.
Or you could click on the picture:
There are some good notes on this topic from this website.
How to set up a limited company:
Link to Companies House documentation:
Go to to m.socrative.com on your Smartphone.
Enter Room 151756.
Other legal considerations:
Trading Standards
Details here.
http://www.bbc.co.uk/news/business-34403005
Licencing
https://www.gov.uk/licence-finder/sectors
Record keeping
National / local laws
VAT
Regulations