Create administrator to approve added records

I was wondering if there is anyway to create 3 levels of
access into my database. I already have my database
password protected, but I was interested in creating two
other levels of security:

1. Create a password for editing the main data table.
2. Create an administrator who must approve all added
records.

Number 2 (Creating an administrator) is more important
than Number 1 (as the client doesn't altogether trust
those populating the database).

Thanks,
Kendra