Done market research to know if they area is worth trying to make money from which it is. The market is only getting bigger, with more people wanting similar services carried out. And the potential audience are the type that will pay for this service.
Got a rough idea of prices I should be charging for my services looking at competitors (which tend to over charge) which I'm taking advantage off.
Drawn up basic forecasts based on a low sales amount and still would make profit even after factoring energy costs, stock and so on.
My market area isn't already saturated with other competitors.
Already have potential customers lined up and booked in and set up means for business contact. Also started advertising using various means including business cards and social media.
Created accounts with companies to get cheaper stock (so the customer is satisfied among other things).
Organised from the start, using invoices for customers and having all relevant financial paper work (the misses is doing more of that side though, I just made the templates and give her all details).
I can also talk 'business ********' as it were. I have a habit of convincing people to get extras done (which has been the case recently).
I could go on but a) it's only a small business (I'm focusing on studies but doing stuff properly) and b) I see no need to prove myself to you. Just be rude not to answer.
Also, if there are any mistakes above, I'm on the iPad so may have hit keys by mistake.
Edit: A lot of business is common sense so I've probably missed bit you may find vital out but I've already considered.