Hi Will, I'm an independent advisor and will try to help.
There are a few ways to do this. The question is how secure do you want it to be.
The easiest way is to hide the Navigation Pane (File>Options), Suppress menus (DoCmd.ShowToolbar "Ribbon", acToolbarNo). Set a default form (also in Options) that only allows the user to open the forms you create. Set the AllowAdditions, AllowEdits, and AllowDeletions properties to False. Finally save the database as an accde.
This will, effectively, block users from editing the data and the database,
If you need further clarification on this feel free to ask.