$2k is a huge nest egg to start with. Get to it! I would strongly encourage you to get your hands dirty before investing all of that into equipment and supplies though.
Go ahead and go out to your local thrift stores and spend a few hours looking anything and everything up that you aren't familiar with personally. Once you see what they sell for and how many are for sale (if 2 sold recently but there are 100 listed you probably don't want to waste your time or money) you can determine if there is enough profit there to be worth your time and money. Personally, I'm not going to buy a $1 item I can only make $5 on unless I can buy several of it. It's a good ROI financially but the time and effort to take pics and make a listing and then ship it just to make $5 is probably not there.
If you haven't already, I'd suggest separating your reselling funds into a different bank account just to make it easier to track everything.
Assuming you already have a printer, I'd hit up Amazon or an office supply store for those half page sticker sheets (1 whole page with 2 half page stickers) to get you started with labels. Once you have done this for a month and determined if you actually like doing it then you should look at a thermal printer, but these sticker pages are still useful to have for places like Mercari that don't yet offer a 4x6 label. If/when you get a thermal printer, don't feel like you HAVE to get Rollo because that's what the youtubers have. Those are $190 and I bought a K Comer brand one for like $140 that came with a label holder that has been AMAZING. Heck it's on sale right now for $93.50 (https://www.amazon.com/Shipping-High-Speed-Printing-Shipment-Compatible/dp/B08D7J1S34).
Keep and reuse your own amazon delivery boxes, ask friends for boxes, order a 10 pack of each size of the FREE USPS boxes. As you buy and sell items you'll start to get a feel for the kinds of items you're most commonly flipping and needing boxes for so that you can then order the right size boxes in bulk if needed. I still manage to get buy with my own re-used boxes and ones I get from the cardboard dumpster outside my office building. I've only had to buy a few boxes at walmart for really large items I sold. Don't buy any boxes at Target or Office Max, they're crazy over priced.
Once you've been at it a while you'll get a feel for what you need as far as supplies. Maybe your room is well lit and you don't need lights right now. Maybe the box cutter you already have is great so you don't need to buy a new one. Maybe you resize a lot of boxes and need a resizer tool, maybe you don't. Maybe you need shelves, maybe you need bins, maybe you need a shoe rack, maybe you sell everything on Amazon FBA and don't need any storage at all.
The point is this is easily something you can started with now with what you have, no need to save up thousands of dollars and then spend all that money on equipment and pallets and stuff just to realize you don't actually like doing it. No matter how fun it looks on youtube, flipping is work. It can be fun, too, but it's still work.