How to search for a MHP to purchase

Ive started my search for a mobile home park after spending a few months Studying with the home study course. My question is how do you narrow the search down on all the parks when the available data on each park is usually very limited and incorrect? Are there basic numbers you start with to narrow the search, i.e. you only pay x amount per pad. Also, do most people mainly work off of the listing on this site and loopnet or are there any other strategies to use. Just trying to get a gameplan on the next step.