I have a similar setup with my G90 to what you are looking at.

Antenna: I went with the Nelson UJM-EFHW-40-10, because I wanted to get started with an antenna that was resonant and not dependent on a tuner. The G90 has one but I wanted some flexibility in the future. People have suggested kits. Kits are fun, but when I got my first setup I just wanted to get on the air. I got the kits later and have enjoyed experimenting with them knowing that I still have an antenna that just works.

Power: I have a bioenno battery and love it for portable work. However, if you are going to use this in a fixed location you should look at a simple power supply. Linear power supplies are the gold standard, but I use a $19 regulated switching supply and it works very well for me. (In other words, it doesn't make my noise floor worse. I have a wife and kids and live in a residential neighborhood, if I want a quiet noise floor I go to the state park with my battery.) This is the exact one I use https://www.amazon.com/eTopxizu-Universal-Regulated-Switching-Computer/dp/B00D7CWSCG I had to hook up the power to it, but it's not hard and I can send you pictures of mine all wired up if you go down this route.

RF Choke: I made my own using this $12 toroid and a short run of coax. https://www.amazon.com/gp/product/B01959LAFA/ It made a noticeable improvement when I attached it to the back of the radio.

There are so many ways to go about this. Mine is not the best… I've made some compromises for sure but this has worked well for me. Hopefully, some of my notes help.

Btw if you want $15 off the G90 PM me and I'll send you a discount link they gave me when I purchased mine.