WEB SITE DEVELOPER/ WEB MASTER

Here is what we need: An online web application that features student-teacher-room scheduling for private lessons. This scheduling component drives an accounting component that creates QuickBooks-style invoices automatically for the scheduled lessons and creates a report for the lessons as a basis for payroll and room usage payments. The accounting module would also keep track of payments, takeonline payments from students, print our/email collections reports and statements, etc. It would also be great to have an online registration module for lessons. We also would like to start an online store of musical instruments, sheet msuic and accessories. Is there anything in the Joomla Open Source world that could be plugged in/installed to drive such an online store. We also need someone to continually develope and maintain our various school sites. We have schools nationally and have different websites for each, plus some general sites for all of them.