Access Project for Human Resource Tracking

I have a front-end and back-end built and it is already in use. 1.)I need some data calculations based on that data done for summary pages on each employee. These are for Health, Dental, and Vision deductions. This data is already in the system and is very simple, but I have reached the end of my knowledge of VBA and need a little help. 2.) I would like to add a user log-in form that accounts 4 levels. A simple table with usernames, passwords, and access levels should do fine and I can easily update it. I would need to be able to send each user to a specific form, no other restrictions would be required. Example: If Level 1 go to EntryForm, if Level 2 go to SimpleForm, if Level3 goto AdvancedForm, if Level 4 go to MasterForm. 3.) A form/report that would allow me to gather a calculation of the attendance (missed days) of en employee and divide that into the total available work days. I can easily do this in excel, but I would like the report in Access if possible. It would also be nice to be able to run it for multiple employees. Example: (MISSED - NETWORKDAYS) / NETWORKDAYS Please respond with a quote per item (1-3) not a total. Also, be aware that I will want to have this done remotely on our system so that the files do no leave our company and the work can be supervised.