There are several factors. You need a controlled environment. Proper, temperatures, humidity and ventilation with odor control by using a carbon filter on your exhaust fan. Temps need to stay around high 70s, low 80s lights on and low to mid 70s for lights off. Humidity around 40-65% for vegging and less at around 35-50% fro flowering.
You need to start those germinated beans in a good mix for starting seeds in(obviously) Something with very little to no nutes at all. Such as Promix, Sunshine mix, FoxFarms Light Warrior or Jiffy seed starter mix. After the first couple weeks(12-20 days roughly) you can transplant into your bigger container and with a nuted mix if you prefer. Autos do not like nutrients early, you will stunt and or kill your plants. You can start in the final pot, just be careful with watering and the nutes. Not much water is needed for the first week or so.
Generally the bigger the container the bigger the plant up top. It's all about feeding the mix which feeds the roots which feeds the plant which feeds the buds which is what. we. want.
HPS is great, just don't have it too close to your young seedling plants, it will cook them. Around 2 feet from the plants to start and when they get a couple sets of true leaves(first ones are single fingered and then it usually increases to 3 finger then 5, 7 and so on) then you can lower the light a little closer. Others will chime in with more HPS experience I hope.
Ph ph ph ph ph php ph PH is
super important. If you don't have a good digital ph tester for your feeds and runoff then you need one yesterday, before you started germing those beans. Ph is a must, unless you reeeeallly know your mix and setup, even then it's tricky to rock around. :dance2: Without proper ph levels your plant will not uptake nutrients at optimum levels and your plant thus yield will suffer. Auto don't have much time to recover from being stunted, so be on point!
Water is key as well. You need a good water source. Something low ppm and with a ph not ridiculously high, somewhere around 7-7.6 is fine. City water is sometimes ok, but you ALWAYS need to let it sit out in a jug for at least 24 hours for the chlorine to evaporate out, chlorine's no good for herb. R/O(reversed-osmosis) water is said to be about the best. Distilled is good too with a zero ppm and neutral ph. PPM is part per million of particles in your water, be it various minerals and nutrients. Keep in mind with distilled water you will need to add everything you need, where as spring water, well and city water have trace amounts of certain elements such as calcium that are beneficial to your grow in the proper amounts and given at proper ph. Getting a small air pump for aquariums is also a must do IMO for your water. A cheap one is fine if you're just doing a gallon at a time like I do. The air pump with attached air stone and into your water jugs 24 hours a day. This bubbles, mixes and highly oxygenates your water. Roots
love oxygen and this is a widely known tip for supercharging your water.
I am sure there are other things I could go on about, but this is a start. Browse around, use that search bar, read other grower's journals and soak up knowledge. You can always learn something new, mate.