The first thing you need to sell is yourself. People buy thing from people they know, like and trust. So what is in your control? Get to know people! Ask question and find out more about the people you are trying to sell to. What are their problems? What results do the want? Next, be a likeable person. This may be the way you dress. First appearances can be a big deal. Once the first appearance is done then it comes down to the way you talk, act and treat that person. Keep providing value to them and gain their trust. They need to know you will be there for them when things are not working out.