Answer:
You either have a lawyer draw one up and then you deed the property to the trustee, or you can hire an "institutional" trustee like an investment bank, sign their form of agreement, and deed the property to them as trustee. Either way you need an acceptable trust agreement that is valid under your state laws.
Trust law is one of the most complex areas of law. A trust should be drafted by an attorney who specializes in trust and tax law so the trust meets both the needs of the trustor and the requirements of the law. An improperly drafted trust can be costly to correct down the road, if it can be corrected at all.