One very important thing that will determine your success or failure in you business is product knowledge, it is crucial to take as much time as needed to learn about the products or services that you are going to be promoting. You may join a business because you like the product or service that is offered, maybe you are already familiar with it, but you should also know that once you become a representative of that product, you are expected to know a great deal about it.
Most companies will provide you with a back office that contain many tools to help you build your business, use them. You have to be able to answer your prospect's questions yourself and not depend solely on your sponsors. Your sponsors are there to help, contact them as well and they can help you better understand your business or clarify certain areas of confusion. Ask them what works for them, how are they marketing their business...
Prospects are more likely to join you and your business if they trust you and see you as a knowledgeable person and a leader.