Hi Pride,
You will get lots of advice on here; there are lots of experienced cleaners.
You can use the search option at the top (enter a word) to find out about things you are not certain about.
Many on the forum may ask you questions so they can better give you advice, this may very well change your thinking on things. Really weigh up what you are told, as it can make thing so much easier for you.
One thing I would say about your comment;
“am going to be van mounted in a citreon berlingo or peugeot partner"
If you have yet to acquire a van, Try to get a bigger van as being able to carry more water will be a major concern as you get established.
Like many with small vans, if I could start again, I would have got a bigger van.
This is an issue you will see discussed on here quite a lot.
All the best
Martin