For being tipsy and full of turkey, you didn't do too bad on those purchases! The 65S Lite and the 800D are both good products for the price. The Beta65S Lite is also a really good flying Whoop out of the box, and can rip when you upgrade the firmware down the line.

The 65S comes with the "stock" version of Silverware. Eventually, you want to upgrade that Beta65S Lite to NFE Silverware. Do that that, you need an STLINK programming tool. Personally, if you've never flown before, I'd wait on doing the upgrade though. NFE Silverware rocks, but it's pretty aggressive. The default Silverware on the 65S Lite is better tuned for a beginner. If you want to program the board, just look at the YouTube video on flashing the 65S Lite to NFE Silverware - it goes through all the steps. The programming pads are tiny, so I ended up just stealing some leftover legs from resistors and shoving those in the pads and then into the connector to the programmer. It wasn't pretty, but it worked.

You definitely want a good radio - the QX7 is probably the better option. They're more expensive on Amazon than through another retailer. I like RaceDayQuads as the prices are good and the shipping is very fast. For the Bayang protocol, you just need a cheap multiprotocol module. The iRange is very good, but expensive. Personally, this cheap one works just fine even though it's fairly short range. BETAFPV has a slightly cheaper and much longer range one, but it can potentially bend the pins on your radio, so I don't really recommend it until that gets fixed. Figure spending about $150 for your radio gear, more if you get a better battery for your radio. (It comes with an attachment for AAs, but it will eat those batteries annoyingly quick.)

The 300mAh battery should work on the 65S Lite - although they are REALLY fast the first 30 seconds or so. I like them, but they might be a bit much for a beginner.

For a charger, there's a bunch of 1S battery chargers out there, most of which are the same design. You also need some power supply to it, but those are super cheap.

For batteries, there are plenty of options. I fly BETAFPV 260mAh for my primary battery, mainly because they come in packs of 8. The 300mAh ones give very long flight times, but they are pretty aggressive. GNB batteries are some of the best, but they are physically longer than other batteries. Crazepony 260 HV batteries are cheap and work well enough. Just remember that you need the PH2.0/PowerWhoop connector instead of the smaller JST 1.25 connector.

For the VTX, you can either keep that as a spare, or mount that to your truck. I doubt it has the right connection to plug right into your whoop batteries, but you can get a PH2.0 pigtail and solder that on to the camera power wires. That will let you connect right to your main flight batteries.

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It should. I use high voltage (4.35v) batteries on my E011C builds and they work great, but you can get regular voltage (4.2v) batteries instead if that's something you're worried about. The charger that came with your F36 will only charge batteries to 4.2v anyway if you use that one. Also the F36 uses a JST PH 2.0 connector (2.0 = 2.0 millimeters between the electrical posts) just like the tiny whoop stick batteries, but they have the cable on the battery instead of on the quadcopter. So you'll still be able to use your same square batteries, but speaking from experience, the square batteries can't discharge enough current to handle upgraded motors.

If you decide to get another charger, I use this one and it has worked great for me, but some people say they don't charge to the correct voltage every time. Another good option I see recommend is the Boldclash 1S charger because it lets you set specific charging rates for each battery and has better built-in protections. Neither of these chargers come with an AC adapter. I just use my laptop charger (19.6v) on the crazepony one, but you can find adapters specifically for these chargers, like this one.