Build a Web-Based Management System with some shell scripting on Linux -- 2

I have some website related work with PHP on linux. I want to know how good are you with creating website and php and mysql coding. My website will be similar or you can say customized version of this one. [login to view URL] I just need to add few buttons and few indicators and generate log messages. check live demo. It'll be more simpler but some what similar. It'll also need to send out email notification. Give me an estimate and your skill set details and your previous history with such projects. I'll need someone who can work long term with me. Future expansion may include running and storing files via shell scripting. Thanks.