There is no easy answer. It will depend what you bring to the table, and how much you want to spend. - MTA - DATA - IP's/SERVERS - DOMAINS You could always partner with someone who might take you under their wing and help you with some of this puzzle pieces, which would mitigate some of the start up costs and access to data. Or you can easily spend $10-20,000.00 on the high end depending on which platform you go with, if you purchase data or do a revenue share, and so forth and so on. In short, too many variable for an easy answer.