In my opinion, the best thing to do before starting a business is actually doing the work to determine if you're passionate/enjoy the work. Once you have been an electrician, you know the joys/demands/expectations of an electrician. Look into being an apprentice for an electrician or if there are any internships. This will give you a "taste" of being an electrician. If you like what you are doing, think of questions like "do I want to continue living/working in this area or moving to a different location?", "do I like my boss? and why or why not?", "have I met the owner of my company? Was I able to pick his brain on owning an electrician business?" Without getting too detailed, I think you've got a start. I hope my answer was helpful!
Then learn and study how to build a business system which would enable easy in scaling your career and business simultaneously.
You can skip the first part of you don't want to do the tactical work, but it is important you know your craft.