Panasonic G7 Video Help for Work!

I've done quite a few instructional, product and interview videos for work, I mostly use Oly OM-D cameras but I do use the GX85 as well.

It looks like you've gotten some good advice already so I'll try and keep mine brief and based on your listed equipment.

Audio if its just going to be one person speaking use a lav mic but if you have more than that put your Zoom in the center and ran it to your camera so its acting as the cameras mic and record the audio both on the Zoom and the camera so you have a back up. Trust me it kinda sucks to get home from a gig and discover that for whatever reason your audio dropped. Strange as it may seem audio can have a bigger perceived impact on your video than your video's picture quality.

As this well be indoors your frame rate maybe very important. Most of the places I shoot footage at have mixed lighting and depending on the angle I can get a lot of flickering at different frame rates. Since I keep my shutter speed fixed to 2X my fps I also sometimes change my fps to kinda cheat and get a slightly better exposure.

Youtube is a wonderful resource at learning video work. There are quite a few good G7 specific videos on most types of video work.

Once you have your setup sorted test it out in the room you will be doing the interview a few days earlier if possible and test it out. Make sure everything looks and sounds good so you'll have fewer things to worry about the day of your shoot.

Sorry I wasn't as brief as I thought I was gonna be. Good luck, hope it turns out well.