Hi Justin,
As you may have guessed i'm new on the forum, and may i say what a brilliant way to get advice and give advice on all those business matters, i'm impressed!!
Anyway as to your equipment set up that would depend on how far you want to go and how much you are willing to shell out, there are franchises you can take up with various companies which are very expensive but they take care of supplying you with the van and equipment, but you are leasing the van, you will have to read the small print on those, as there may be a few catches!! It's an option if you don't want the hassle of doing all the red tape yourself.
You will also have to find out where your nearest trade waste sewer is and contact them to make arrangements to dump your dirty water containers you will have to pay for this too, You will need to contact the enironment agency to let them know what you are doing. Don't make the mistake other wheelie bin cleaners have made by dumping your waste water in the street drains as the water companies are becoming wise to this and will sue you if you are caught, contact you area water company and the environment agency, they will tell you the same thing, they are on the look out for this as it is contamination! Then this way when you have made all the neccessary above at least you are covered by the red tape of environment issues.
I live in south west Devon, and have a few small villages in the south hams, i charge around £1.50 and i am the cheapest around, i have the full kit, my van does it all for me i dont have to even lift up the bins, but my set up cost me the earth, don't know when i will brake even yet, it will be some time yet!
Happy Hunting, Good Luck.