Type in 'business link' on a search engine.
That site provides heaps of useful information on starting a business.
There are different types of businesses. There is a sole trader, where you work on your own self employed, a partnership where two or more people work together, a public limited company and a private limited company.
Business link provides information on all topics for starting a business. If and when you do have the need for finance from a bank, be sure to have a respectful business plan in order so the bank manager has confidence in you, otherwise he won't part with any money.