No problem! Happy to help!
So 1S means 1-cell, 2S two cells, etc. The batteries you buy are going to have a cell count (and for nearly every FW/MR, it'll say which one to buy!). As far as I know, there aren't any chargers that truly charge both 1S and 2-6S (if they say they charge 1-6S, you need to buy a weird dongle). And at any rate, a good 1S battery charger can charge up to 8 1S at the same time! If you get just one charger, it'll be pretty cumbersome to charge so many 1S's in succession, at least in my opinion. You can have a different opinion!
The 1S charger I use is this.
I use this 2-6S charger (even if you don't get this one, I'd highly recommend getting a dual charger so that charging takes faster! For any battery, it'll take about 1 hour to charge. So you'll save lots of time getting a dual charger-I actually have two duals!).
As for TX, it's a really personal decision I guess. There are 4 main ones, and I'll try my best to list why you'd want each type here:
- Spektrum
- The "Apple" of the TX world in that getting a Spektrum TX is like getting into an ecosystem. Sure, you can use non-Spektrum stuff... sometimes... but a Spektrum TX only works with Spektrum RXs, which are closed source, and works best with Spektrum batteries and Spektrum chargers, etc. etc. And to boot, they're all pretty expensive. Clearly, I wouldn't necessarily recommend Spektrum, but if you want it, you can get the DX6e on the low end and the DX9 on the middle end, and the iX20 as the ultra high end.
- FrSky
- The "android" of the TX world in that there's an ecosystem, but it's not that strict. Most bind-and-fly multirotors are going to be compatible with FrSky. As I said, I don't know much about the QX7, but I do know that the X9 Lite (cheap end), X9D (mid-range), and Horus X12 (high-end) are really good TXs (my friends have them), they're common (likely to work with most bind-and-fly multirotors), relatively cheap, and will do most of what you want.
- Again, double-check the protocols and all that stuff: FrSky TXs & RXs are not all the same and don't interface with all the same stuff!
- RadioMaster
- I use the Radiomaster TX16S Max, so i'm definitely biased! The BEST part about Radiomaster is that you can use any RX you want! It is compatible with all the major protocols so you can use FrSky, Spektrum, whatever! ANY bind-and-fly plane in the WORLD will be compatible with the TX16S, so never any worries.
- If you clicked the link to the Spektrum iX20, that TX is $1700 and guess what... the TX16S does everything the iX20 does (with 4 less channels, but c'mon, 16 is more than enough channels), but at $200! I have the higher end with steel switches, leather pads, which are a luxury, but that tops out at just $400! It's even cheaper than the FrSky high end model. It's such a nice TX and I would definitely recommend. And as a math-y engineer, setting up logic gates and mixes/curves, etc. are very intuitive.
- The link above is for the next version II coming out next month, apparently they discontinued the version I, but you can get version I on amazon, or wait a month for version II.
- FlySky
- My first radio was the FS-i6X! It's a nice 10-channel TX that has everything you'd ever want as a beginner. It's not flashy, not a lot of features, a little hard to set up advanced mixes, but as a beginner, and for only $70, it's super reliable and all you need to start out, in my opinion. You can "graduate" to a better TX after you know you're going to be in this hobby for a long time. And I can personally vouch for the quality and this is the TX I've recommended to my friend who were starting out, and they loved it too! One of them just "graduated" to the same Radiomaster TX as mine as well, so it's a good pipeline.
- Beware though, FlySky is only compatible with flysky RXs, so the Tinyhawk III is not compatible unless you open it up, buy an i-BUS FlySky RX, and solder it in and do some DIY configuring, or buy a quadcopter that explicitly states that it works with Flysky, like this one).
Also, if you plan on doing FPV with the plane as well, get a good all-in-one camera like this, or get a camera/VTX combo like this and this. I'd recommend the AIO camera since it's lighter and the Flite Test trainer seems pretty small.
Hope this helps!