While I don't yet know specifics about this property, I can tell you that it is rare that owners will finance but it does happen. When owners do that, they are basically acting as the bank. You would need a downpayment, proof of income and need to know how long a period of time do you want them to finance it. The most common way I have seen it done is for owners to finance (you pay them) for a period of 3 to 5 years. Within that time, you are expected to secure conventional financing and pay them off. I've also known owners to just finance it until it's paid off although extremely rarely especially with properties listed by a realtor.
Scott is right, it would be in your best interests to have an agent working just for you with only your best interests in mind. It costs you nothing, the seller pays all realtors involved.
Hope this helps!