Creation of a "Virtual File Cabinet" Database

I want to create a database that will allow me to track 45-50 entities and will allow me to monitor status on various activities (i.e. are taxes paid (federal, state and local), is the entity in good standing, tax i.d. #, ownership breakdown (%), existing lender, when loans are due, etc. Ideally I will use this database to monitor a number of properties in real time. Additionally, I want each file to include the partnership agreements, tax returns, formation documents, various other electronic files (PDF's, Word and Excel files). I know this can be done in Filemaker Pro or something similar, but I don't want to have to take the time to teach myself how to create it. It needs to be stable, easy to add documents to it, and should be accessible between Macs and PC machines. I have all the documents and can scan them but ideally I want to replace the file cabinets I have and use a "virtual file cabinet". I want to work with the person who creates this to refine and delineate exactly what is needed once we get started.