The ideal scenario is a south facing roof but they can also be mounted on an east/west split, it is best to avoid putting panels on a north facing roof.

We slide a tile out of the way so that roof hooks can be attached. They’re screwed into the rafters of the roof so the weight of the panels rests on the load bearing beams. We then put the tiles back and attach rails to these hooks which the solar panels can then sit on

Yes it will. Panels are set up in strings, so if one panel is fully shaded, it will limit the performance of the whole system

An inverter converts the power from your panels into power you can use. The inverter can then connect to a battery, and put excess power into it, or pull from the battery when there is not enough solar. They can also connect to the internet and give you values on how the solar is performing