I love your enthusiasm, although, the employment section isn't a great area for business advice. You should pick up some books on this topic from your local library; they are likely to have relevant information based on the state you live in.
I will say, from experience, prior to starting any business as a sole proprietor, you should have about 6mos of expenses in the bank, plan to work 70-80hrs per week for the first 3yrs, make a decision on how to register your business (LLC, Sole Prop, etc.) and how each type effects your liability, income, and taxes.
I will comment that your business concept sounds nice, although, to me, it sounds like waterproofing is a great idea IF a person has the extra money for it. If not, that sort of service is typically done when a problem arises (i.e. contrast between preventative maintenance and reactionary measures). This particular economy might not be the best to start a business that is a "nice" thing to have, but not necessary. Consider co-mingling your product with realtors and home inspectors and even banks directly since that group might frequently need a solution before a deal can move forward.



