You are asking a bunch of ?'s that are relevant but most can wait at this point. Take your time to do it correctly. If there is limited space just do 12-20 seedlings this way all will come to fruition. Sounds like ya also understand plant structure & growth so it should be fairly simple. Stick with the basics visa vie proper soil mix, lighting & nutrients. You do have time with nutes so get the soil/lighting correct & yea 24/7 lights would works just fine! Hope ur hubby feels better. Peace


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