Client Management Script

I need a client management script. This script will have the following features. 1. Login Modules for Admins 2. Ability to create a new client with details information 3. Ability to review all clients 4. Email System to give ability to email clients 5. Automated email alerts for both client and admin for contract renewal. This will be a simply enough script and will not be too complicated, but i need this done very fast and very professionally. I will discuss in more detail the requirement once i have selected a winning bud. ** A complete yet simple client management script **