My brother has hundreds of written material and art work he wants me to have exclusive rights to so I can use, print and sell in my business,

The works are already copyrighted -- under the U.S. Copyright Act, copyright arises immediately upon reduction to tangible form of a work of authorship. Your brother can register the copyright in the works (or you can assist him) by making appropriate filings with the Register of Copyright. Your brother can grant you exclusive rights in the works in a simple, informal agreement, or you can have an attorney draft one for you. No particular form is required. Call my office if you need assistance with this.