Joy,
A key to real estate investing is to find out as quickly as possible what they NEED you to do, not what they WANT you to do. They may want you to write them a check for full asking price or a very minor concession. But what do they NEED? Were they transferred and can't afford two homes? Are they getting divorced and one spouse can't carry the property on their own? Did they buy another home and can't sell their old home as easily as they thought? Are they just testing the waters and don't really need to sell? ETC.
Finding out their real needs and motivation is the key. All the questions suggested to ask above are all you need. Keep it simple. Write down one or two and call someone. You will quickly learn they won't yell at you if you don't know one of their questions. If you get flustered, say you have another call you have to take and put them on hold and compose yourself. Or if you have no idea what to say to a question, say something like "That is a great question. I don't know the answer off the top of my head but I will find out and call you back."
Just start making calls. Your fears will pass quickly if you just do it.
Good luck
Mike