Cisco CME configuration review, changes and fine tuning- ASAP

I have a new installation of Cisco Unified Communications Manager Express (SIP) on a 2901 and need some configuration assistance and review. I would like to start with a 2-3 hour block of time via zoom or webex. Work can be performed either during the day or evening. I will watch, learn and ask questions so good communication and teaching skills are necessary. We can add additional hour based on need, skills, fit and teaching/communication skills. 2901 and 2960X is setup in lab environment. I will integrate with production network in the near future. Phones (1) 7861 (18) 7841 (2) 7821  So far, base configuration is setup with: Base switch config (2960X) setup with data/voice vlans 802.1q trunking from switch to router DHCP option 150 setup tftp server firmware setup and (3) phones registered. station to station 4-digit dialing setup Outbound dial-peers are setup for one fxo port Inbound dial-peer setup for one fxo port Need assistance with completion of setup for (3) phones and I will replicate on other phones. Need: inbound dial-peer rollover to 2nd, 3rd and unity outbound dial-peer rollover, i.e., if line one is in use, roll over to line two for outbound calling Button appearance- extension and outside lines as required Extension appearances on 7861 phone Overall configuration validation, codecs, voice quality, debugging, etc., as current voice quality on a voice call is low (can barely hear each other on call) General questions and configuration changes Time permitting, begin Unity installation Communication via phone or conferencing ([login to view URL]) Desired Skills Cisco, Unity, Cisco CallManager, SIP