There's a search button on the taskbar - use keywords such as:
pricing
equipment
marketing
You will find an enormous amount of information. You may also find someone who will allow you to tag along before you invest anything to make sure that it's something you're certain you'd like to add on.
You may also want to do searches on:
insurance
licensing
EPA
CWA
Clean Water Act
Reclamation
Chemicals
And lastly, there are tons of different areas of pressure washing. Try these
Fleets
Residential
Commercial
Wood
Flatwork
Best of luck and Happy Reading!
Celeste