For various reasons, the most prominent of which is fun, I have been considering starting my own print-on-demand publishing company. Assume I have printers and distributors set up, and authors. What do I need to do? I presume I start a company and call it "XYZ publishing", but are there any other legal requirements apart from filing my taxes? The company would probably be based in the UK. I gather I have to apply for ISBN registry with the national branch office, what else?