Database and "Intranet"

What would I have to do to make a database that employees (and only employees) can access on the internet? For instance, if the office wants to be updated on projects done while an employee is on the road (for time sheets and pay roll and such), they would need to be able to type in a password to enter into the area where they would type in several fields of information. They would then send the info into the database, where it will be retrieved by someone back at the office.

Can someone tell me what all would go into this? Or, since it is probably a bit extensive, can someone recommend a good book dealing specifically with this task, one that could walk me through all of this? Would this require Dreamweaver UltraDev?