Trying to understand Land Contracts

[Jeremiah Dunakin]

Hello all. Currently I have one sfh. It is a traditional mortgage. I am trying to understand land contracts and how they work. I have a few questions on the process.

1. How do the terms work? Is it for 30 years?

2. Is there intrest in the payment?

3. Who holds the title. 
4. are realtors involved, and closing cost.

5. What are advantages/ disadvantages for both seller and buyer