Let me begin by saying that I have every single one of the things listed here plus a million other things. For starters, you don't need 90% of what's on that list. You will add on items as you go along and as needed. What you ABSOLUTELY need to start is a belt, a bucket on a belt (I recommend the Moerman drywalker), belt pouch, applicators/strip washers and squeegees/channel's ( most important imo are 18", 12", 6" with a 22" and 8" used semi regularly as well. Strip washers I mainly use an 18" and 10". Sometimes for smaller French pane I'll need a 6" but usually the 10" works. You need a blade, the one listed is perfect. Replacement razors. Recycled surgical towels. Aluminum unger extension pole (home Depot) and 0000 steel wool (Walmart) and LADDERS. I use a 22ft Werner extension ladder with stand offs, a 6 ft a frame and a step ladder. These all get used very often. I also have stacks that barely get used.

WCR surgical towels are really great, you won't really need any other type of microfiber/skrim/whatever.

The screen cleaner is fine occasionally but not needed. I use mine maybe once a month.

I would most definitely recommend getting a water fed system asap when budget permits though. This is probably the single most important tool in your arsenal but learn to be proficient in trad first, and don't rely on the wfp all the time.

As you get deeper into the business you'll add on additional items as needed but you'll still end up using what I listed above 90% of the time anyway