Control Panel Design for a Water Production System

My colleagues and I are rehabilitating some water production systems in Nigeria, both ground and surface water, and I am currently looking into rehabilitating a (very old) control panel. This is the first time for me and electro-technical matters are not necessarily my forte, so I was wondering if I could get some assistance in how to work out the required protections. I have worked out that for over-current protection I need a thermal overload relay set to the maximum operating amperage of the motors, however I am stuck on some other protection equipment and would love some guidance. Specifically for voltage drop, phase failure and phase sequencing protections, what do I need and more importantly, how do you size them? Are there any other protections required that I am missing (apart from lightning protection)? Thanks in advance for your help!