To tell the truth it is a rare art school that covers the business side of art right now - at least in the United States. Sad but true. If this is your main concern then rest assured us art school graduates generally don't have an edge there and we learn to sink or swim on our own. >.<
For financing, do a search for artist grants. I don't know whether you have something similar for the London area(I would be surprised if you didn't, though, big city!) but Chicago, where I am from, has a huge resource site for this kind of thing, listing grants, exhibitions, etc.
Also - again, don't know how relevant this is to the UK, but there is a great annual publication with tons of listings and contacts for galleries, magazines, publishers, etc. that are looking for new artists and designers. If not relevant to Europe, maybe you can find something comparable?
You need to learn to talk and write about your art, especially if you are interested in more conceptual/cerebral work. The more interesting things you can say about the work you produce, the better! I would recommend going to a couple of galleries that are running solo exhibitions and asking to see the artist statements to get a good grip of what this entails. Also, applying for a couple of relevant group exhibitions might be a good start, to see whether you can start getting some exposure that way, just make sure to have a portfolio online to refer people who might be interested in your work.