Contrary to Twenty20's advice, you can just take out money when you want if you are a sole trader.
Dividends are only payable for directors of Limited Companies.
I understand that you are busy but a course really would help you. You also need to speak to an accountant for advice on this type of issue. It may be better for you to start the whole thing as a limited company rather than a sole trader but that is not a question that can be answered on here.
Try
http://www.businesslink.gov.uk as they have some decent advice on their website as does
http://www.startups.co.uk
There are also some events in the evening that might be of use to you. I doubt that you are in Norfolk but if you are there is an event locally called neat business club which is held once every two months specifically to help new start businesses.
http://www.neatbusiness.co.uk/ You have a panel of experts (accountants, business finance broker (me!), bank, solicitors etc) who are all there to answer your questions for free.
It is associated with our local chamber of commerce, so I really would (if you don't live in Norfolk) ask your own Chamber for advice.