I want to open my own day nursery, how to do I do it?

A detailed business plan would be a good start - a vague shopping list isn't enough if you want to impress a bank sufficiently to lend you money for a property. You'll need change of use permission from the council if the property is classified as residential - and very details plans are needed to persuade the local planning committee (likely to take at least six months to a year to get an answer).