I was just like this when I started on Aquatec site, now I'm not too much better. I think there are too many questions there, but from my limited knowledge ( so none of that "Luke thinks he knoes it all"!!! ) here are the answers to some of your questions
1.make your own or have the window cleaning warehouse do it, these systems are the same as a twenty thousand pound ionics system, they do the same job but for far less money.
2.depends what you do but probably 500-2000 quid
3.you earn more, because it's quicker
4.how likely is that with our weather!!! anyway collect rainwater
5.depending on your area and speed 10-80 quid. Depends on your pricing etc etc
6.the same, it doesnt matter how long you take its about how much money you want to make
7.canvassing in person