If you'd prefer to keep them as ghosts, skip this).

Your sim needs to level their cooking skill to 10 and learn the recipe for Ambrosia (this can also be enhanced with the Fast Learner LTR) (Note: this is only if you'd like to resurrect the ghosts.

The following preparations can be done at any time, but it may be nice to get them out of the way before traveling: The Green Thumb and Angler traits will assist in acquiring Life Fruit and Deathfish if you choose not to install the Ambrosia mod. The Kleptomaniac trait will allow you sim to swipe, and it is absolutely necessary. The Bookworm trait is to increase the speed at which your sim gains skill. The Adventurous trait will allow your sim to stay in places longer, if you need the time.

When creating this sim, I advise equipping them with the traits displayed. The sim does not need to be a ghost themselves, depending on what you choose to do with them after forming the town. This is the sim that will travel and collect gravestones later, as well as resurrect the ghosts.

Sims 3 town mods