You will need to hide well, just get in some brush and when you hear/see ducks stay as still as possible. Theyll pass over a couple times and check everything out before coming in. As @sodfather says, second pass we take em!
Get six mallard floaters and these
https://www.dickssportinggoods.com/p/hard-core-ez-hook-decoy-weights-15hdcu4zzhkwghts1hwf/15hdcu4zzhkwghts1hwf
I know Dicks is a bad word but my work laptop blocks just about every other sporting goods site, you can get them anywhere
You sure can, you just need a few dekes. Sit there one morning and see if there are birds flying over. If youve got crop fields nearby which I'm sure you do you are in business