I'm afraid I have to be the bearer of bad news, but note brokers are a dime a dozen. Everyone who has signed up to take a course on note brokering (usually because they had limited or no success as a real estate investor) has a generic website that is the same as all the 10,000 others.
The dream is that people with notes to sell will come to you. The reality is that if they do call you they are also calling 10 other note buyers, including some direct buyers who can bid higher than you can offer since they are eliminating your commission.
In every business, there needs to be an economic justification for the fees that business is charging. In a web based society, what is the economic justification for the middleman when the seller can contact the buyer directly?
The only way to be successful in note brokering is to flood the local market with advertising, or launch a unique and difficult direct marketing campaign. I usually receive 2-3 letters a week from note brokers offering to purchase my notes so obviously direct mail is over used. You would probably have to develop a source of note holders and cold call them, a thankless and difficult task if there ever was one!