Thats great advice. I started my wedding video business around that same method and while my business isn't fully matured the growth is significant from 5 years ago.
Some good advice that was given to me years ago is "If you're good at something; don't do it for free."
My take would be get an LLC. Heres why, it allows you protection from fiscal damages that may arise later. An LLC will allow you to have privileges that a sole proprietor doesn't have like access to better pricing on insurance and access to productions insurance which you will need. It simply makes you look more professional also. To keep track of everything create an excel spreadsheet to help organize everything and there are templates out there just google "Profit and Loss excel sheet template".
If you make a ton of money this will help you, and if you're making money later then you can simply pass off this responsibility to tax professional. Having that LLC done early on will give you peace of mind.
I hope this helped.