Guys,
I thought about exactly the same thing, running cargo from E.Mids to Edin. I even had the business sorted (trade that is) but the amount of crap you have to go through plus all of the horror stories of some people spending 100k just to get an aoc not the official 12kish (inc one plane). Obviously I didn't bother in the end which is a shame because I was on to a real money maker.
My advice is to get into a charter firm for a few years, see how they do it and they try it, not before! Or you can just ignore me, I think most people do!