I would like to hire a FileMaker Developer

Hello, We are in need of a new solution to track our business operations. I would like to hire someone who can make a file maker pro program that will be installed on our server in house and accessible from anywhere in the world. We will need a pretty normal type of application that can track customers/clients, sales, make invoices, track automatic recurring scheduled shipments, modify inventory when auto shipments are fulfilled, automatically generate emails to corresponding vendors when inventories of stock gets low, we will also need many fields for information, types of products we are sending, how often we need to send them, serial numbers on machines they have, what type of scents we need to ship them. This is going to be overhauling 2 companies owned by one person, so we'd like to have just about the same thing on both companies, maybe a tab for each with the customized options in each one. One company sells essential oils and atomizer machines that add scent to the air or airconditioning system of homes and/or businesses, and the other company sells On Hold Music for your telephone. So the applications will differ a little bit, but we'd like to have them both on there. My price may be high, or low, i just guessed as i am not sure what this would cost except for the research i've done, so it is negotiable. I would like this system to automate as much of our processes as possible so we can grow without being disorganized. I am willing to write an outline of much more detail if it is needed, or speak with someone over the phone to create a more solid plan. I have been elected to outsource the production of this program, but i'm not a programmer so i definitely need some help.