Local advice may vary, but here we just time application before a rain forecast, and hope it's not a monsoon that's going to wash everything away. We can get rain rates above 6 inches per hour, but being a lot farther north than Florida, that kind of stuff definitely happens with less frequency up here. So, usually not a huge problem.
for your soil (fluffy sand) anything would work but I would look at what will be your future used for it.
Well, the dang price of 5 and 6 ft disc harrows is insane locally... $975 for a rusty used 6 ft disc? I found one about 2h30m away for $75, but "every disc will need replaced" which is fine; but if you need bearings, spacer, ecr; the cost to rebuild would be atleast $600.
yes it will happen tilling would reduce that or a light rain.
Yeah, I actually have one already, and have considered that; I have also considered the $199 Vevor towable, 100# capacity, drop spreader, that has the rotating teeth on the front; and the putting a piece of chain or something behind (or fabri cobbling a rear roller).
yes you want to roll it after seeding you want a good soil to seed contact for them to sprout ... if you walk and your boot sink in a inch its too soft.