Do a search on the word "insurance" and read as much as you can.
I suggest a minimum of $500,000 liabiity coverage. The equipment is sometimes a shady area. My policies have always insured market value, rather then replacement cost.............which I don't like. If it's stolen, destroyed, or whatever.......I'd probably be stuck buying used equipment...........not cool. My point is, shop around.
Also research something called "Care, Custody, and Control Insurance". It allows you to be covered for damage done to what your working on. For example, if you damage someones siding while doing a house wash job, you might not be covered under your general liability policy. The CC and C would cover it. This costs extra, and in some cases is not even available. Ask around.