or you can call local realtors. You can decide whether you want the agent to just find the tenant and draw up the lease or you want the company to also manage the property. Call three companies, ask them their experience in rentals and their fees. Tim and Michael have given you good advice.
I would seek advice as soon as possible becuase you want to get your place rented before the school year starts. Usually families rent 3 bedroom homes.
I would call a couple Realtors or go to an office, or two, and speak to a couple and "pick their brains". This should help get you started. They should be able to explain what they do with a rental and perhaps give you an idea of a monthly price that is appropriate for the condo. You can use their service or list it for rent on the internet or with flyers etc. There will be pros and cons to each method and you will have to decide to let someone else rent it or do it yourself based on what you find out talking with Realtors. Good luck, finding a good renter can be difficult sometimes.