Renting a permission list for the first (or even third) time can be a bit confusing. What's normal for transmission fees? How speedy is the turnaround? Should you pay extra for brand endorsement? Should you rent more names than the minimum to run a test? Etc.
Here's a handy toolkit from MarketingSherpa to help you (also useful for training staff). Includes two sample contracts with key legalese noted, as well as a How to Read a Data Card PDF.