I got an El Gato HD60S to connect my GH5 to my PC. It works well, but it was a little fiddly at first. It is currently sold out at Amazon right now, too, but when it's in stock it's about $160.

I use a MeFoto travel tripod for mine. It sits on a table in front of me so just whatever can hold the camera works fine.

For an A/C adapter I just got this: https://www.amazon.com/gp/product/B0744J4M8Q/ref=ppx_yo_dt_b_asin_title_o09_s00

Good luck! It's hard to find capture cards right now, but once you get one it's pretty easy to get going.