Clean up an asterisk pbx system and add some features

I am in need of assistance with a clean up and addition of features to an Asterisk PBX system. Specifically, I'd like assistance with setting up an IVR menu which can be used to direct customer calls to the right departments. Additionally, I would need the system to be maintained regularly after installation of the features. I have a preferred method of communication through email and am eager to find an experienced freelancer for the task.