First, you have to license your business and build a server that can handle thousands upon thousands of text messages and process keywords. Then you have to work with the mobile phone carriers to get your message out there. It's estimated to be a $25,000 start-up at the low end. For more detailed information, please go to http://mysmsbiz.com/ .
The first step toward starting an adult texting business in the US. is to find an SMS gateway provider that will distribute your messages. You must also determine the media you will use to market your adult texting business to potential customers.