How long does a listing contract last? - Negotiable between agent and client. Typical for Aaron Luttrull: 6 months.
How much is the commission? - No regulation on commission. Varies between agents.
What kind of other costs will I have? - Typically some title costs, part of the closing fee. However, costs vary with specific offers and different buyers.
How do I cancel a contract? - Talk to your agent and see how you can be released.
Is now a great time to sell/How's the market? - Can vary from day to day, but generally you will be looking for the least amount of time on the market and the best price for your home, so make sure you talk to a professional to see when is the best time for you.