If you are in the fortunate position to find a company (not many companies have fixed floats) to do a float endorsement and the company conducts touchdown autos to the water, this will assist in judging approach speeds, flare heights and picking swells etc.
HUET courses are worth more than their weight in gold.
Lifejackets that double as survival vests with a minimum of ELB, mini flares, fluorescent marine dye marker, floating torch, good quality fixed bladed knife and a small oxygen bottle (spare air) for those vital extra seconds.