In general, the first step is to put that grounding rod, put a big enough wire (whatever the standard is for 32A will do) from there into your house. Your groun

In general, the first step is to put that grounding rod, put a big enough wire (whatever the standard is for 32A will do) from there into your house. Your ground circuit can be separate from your regular wiring, that's okay. Don't make any funny loops in the circuit, nor any connections to rebar. (Any double path to ground is a circuit when funny things happen.) Once you got that, pull a ground wire to your panel as well and install a surge protector. This goes after the main switch, before any RCD. (It basically passes any surge into the ground, tripping the main switch if big enough.) Then install RCDs, if you don't have any. They'll trip if the power pulled from live and neutral somehow mismatches. Which ones to get depends on your type of panel and loads.