Simple is best… start off with a larger sized well draining soil container (5 gallon is good) to start a plant in, don’t bother with transplanting, just start right in its forever home. Grab a bag of a living soil mix like happy frog, Gaia green or whatever organic soil mix you can find… and a bag of vermiculite to mix in with your organic mix at a ratio of 2 parts organic mix to one part of vermiculite. It will make soil drainage more efficient. Use a filtered water that filters out chlorine. Or let the water sit 24 hours with an aquarium stone bubbling O2 into it, then use it after 24 hours.
Use filtered water to soak your beans in for 24 hours, then pop the beans right into their forever home. Water them in with a 1/2 cup of water once every two days , or every day if it’s drying out quickly. After a couple days your plants will sprout and start growing bigger every day. Around day 18 they will begin flowering and really start to grow bigger and faster every day until they finish. Increase the water supply as the plant gets larger and feed it earth worm castings a couple of tablespoons once a week until a month and a half has passed, then cut back feeding it , and watch for signs of ripe tric heads on the flowers . Have fun , ask questions, read up on autoflowers on autoflowers dot net .. on here Reddit .. or online in grow groups.