What to study before creating a software project

I need help what course should I study to prepare for my first software project? I already learned html,js,php and mysql. I tried to create software for my small business but it’s a total wreck. I realize I need to learn to prepare some paper works before hitting on the keypad and type anything. it’s some kind of a feasibility study or something. Like engineer creating blue print. what courese should I take please help me.
answer! :slight_smile:

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thank you very much…

I only need the No. 3 it’s only me, my wife and three staff will use it very helpful.