How to sell referrals/leads

I am interested in getting involved in real estate , however I lack the capital to do actual investing. I thought I could try selling referrals/leads to investors, sales agents or brokers as a start to getting involved and give me a flavor of what investing is all about. I would do the research and work so all the investor would have to do is put up the money and close the deal. If anyone can offer any advice, regarding how selling referrals generally works, if this can be profitable, and what kind of licenses i would need, it would be greatly appreciated. Thank you for all your help!