I'm in exactly the same boat, though I am in upper sixth, not at uni yet..there's one from the 'for dummies' series which looks ok and this website is pretty useful if you click on businesses, hope this helps https://www.gov.uk/
Although it's not exactly about setting up a business "how to get rich" by Felix Dennis is a great read! He is one of Britain's most successful entrepreneurs who has made hundreds of millions in the magazine publishing trade.
Would definitely recommend this (although neither of us have read it, it's supposed to come with raving reviews).
Attraction Marketing by Stuart Ross
Although not particularly business related 'the secret', if you google it you should be able to find it - it's just about the law of attraction and how your thoughts attract things to them if that makes sense (hope it doesn't sound too wishy washy lol).