Use a lawyer. This is not a standard sublease. Subtenants must also be responsible to abide the terms of your proprietary lease-- that requires special language in the rider. Also, you need co-op approval to sublet and a lawyer will help you with that too (some co-ops don't even allow it). Also, many co-ops require your sublease contain certain provisions for their benefit. Use a lawyer.
I would check with the managing agent for the building and see if they require any particular lease. There is most likely also going to be an application since it is a coop. It may state in that application what kind of lease they will need you to submit and any other rules and regulations they have for tsubmission and for the potential renter.