@Matthew Scott The first question would be to check the zoning. If the home is OK to be zoned for used mobile homes, you'd have to check on any restrictions (i.e. size, age, etc).
From there, you'd have to figure out exactly the sizes of the homes you want to bring on the land and how far you want to space them out. The smaller the home, the harder it is to find a good, used home in decent condition (in general).
Personally, I've known mobile home park owners with this challenge when trying to find smaller mobile homes to fill their lots. Another option is to fill the space with RVs. Though, you'd have to check to see if there is enough demand.
If you need more guidance when it comes to moving the homes and what's involved, you may want to talk to a few local mobile home dealerships. In the past, I've found them to be good information for market insight and referrals.
Before you spend any money, you just need to price everything out (i.e. cost of homes, moving costs, installation, hook ups such as electrical, water, etc).
One last thing, if the land is not developed and does not have the proper infrastructure in place the project will be more costly. Usually, it's best if there is existing infrastructure in place when taking on this type of endeavor.
Hope that helps!