The main part of making a home Internet based business opportunity work is advertising it. The best way of advertising on the Internet is through search engines. The three ways search engines work is through natural search, pay for inclusion(PFI), pay per click(PPC), and a combination of PFI and PPC.
Natural search is free. Say you sell widgets. A potential customer will go to a search engine and put in the term "widgets". The results they get will be a list of sites that sell widgets. Hopefully one of the top sites will be yours.