You're casting a pretty broad net in terms of what you're looking to do.
Have you developed in FileMaker before? Are you looking for a developer to help/train you? Are you looking for someone to build it for you?
If you're looking for table-based account management in filemaker that can match a record in a table to the user that is logging in, then the Accounts module is a good place to start:
However, it doesn't support offline sync, so you may have to heavily modify anything to suit your needs.
I need to develop a Filemaker inventory/order form where people have a collection of assets and they need to either buyout from us or return the assets to us.
I have a little experience with Filemaker but not a lot. I am looking to develop it because I want to learn how to do this.
Thank you for the recommendation.
Filemaker ships with an inventory and assets start solution. Maybe those are good places to start?
Unless you have specific questions, or are looking to hire someone to guide and help you through the process, we may not have useful resources here for you.
FileMaker also has a “made for filemaker” section of the site devoted to pre-existing solutions. There may be an inventory tool there that you can purchase as well: