the business model should be - spend as little money as possible on your channel if your hoping to recoup the money any time soon (like 1-2 years) i do quite a bit of business consultation and that would be my advice.
if i had no idea about youtube and someone came to me for investment or advice with a business idea about creating content for a thing called youtube, then in all reality in would be laughable. "so let me get this straight. you want to spend $500 on equipment and then spend 20 hours a week for the next 2 years in the HOPE you might start seeing some ad revenue from a revenue stream you don't even have control of?. and if your very good (and lucky) you might earn back that $500 in 2 years.....that if you looked at the numbers only the top 1% even earn enough money to call a part time job.....i'll pass"
yes, most definitely have a plan for your channel. just don't consider it a business. consider it a hobby that sometimes costs money, that you enjoy. then a long wayyyyyyyyyyyyyyyyyyyyyy down the line. you might look at and then decide if it can actually become a business. lets say 50k subs or X amount of views. or X amount of revenue a month.
the trouble with thinking to big too early is that you (like most) will get disheartened when your goal is so very far away, and at that point, most give up
have a plan for your hobby, work on your content, work on your SEO and other ways to get your videos out there. set smaller goals, for instance, build a plan and a timeframe to try and get to 1k subs. that sort of thing
unless something magical happens (see Viral which you can never plan) it will take a long long time before you get that money back. just see it as a hobby expense. or a learning expense.
hope that helps. if you want to chat more you can message me