[JBlixt]

If you want to but a good structure for your business you need to ask yourself a couple of questions:
1) What are the legal requirements for bookkeeping, taxes and so on. This you have to put in order. I recomend that you find a solid software for bookeeping. Do not do more of this than you need to!
2) The second part is what you need to be able to develop your business. To keep track of your different websites and how much the cost and generate would be very usefull when you want to decide where to go next. Maybe you will even find that you are loosing money at some of the websites and should let them go.

We are small and do not have that much different websites. But i regret that we did not put it up a bit different from the beginning. Now it is to much work to change all the trackers and so on.