How can I teach myself to do Real Estate Sales? I REALLY want to.

[Steve Candor]

I have experience in real estate rentals and management. Unfortunately I am working at company that does not do any sales at all. How can I get into sales? Can I teach myself? 

I was thinking of buying leads and then showing clients myself? I do not mind spending money on leads and working the clients I get. But I have no experience closing, paperwork, contracts, lending, etc. I feel like I am in over my head? Are there books or a website I can learn from? Is there a way to get a mentor? 

I am located in NY and I really want to get into real estate sales.