Re: What are all these ropes and stuff for?
Drop keels offer the advantage of reduced draft for access to shallow areas, while preserving upwind performance when they are dropped in deep water; sort of a 'best of both worlds' in a way but with the added complication of the raising/lowering mechanism.
30 amps will be plenty; most boats' shore power receptacles are 30A whether you have those loads or not. Most dockside power sources are 30A plugs too, though that's not universal either. A selection of adaptors from 30A to 20A to 15A plugs is handy to have. Keep in mind your on-board circuit breaker is likely to be 15 amps so that will trip before you load your 30A supply - unless you have multiple AC outlet circuits. Also remember that if you've got a 120VAC HW heater coil that's on its own and adds to your usage.
Oh - and welcome to the 'bright side' and to Sailnet!
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345 "FastForward"