@Austin thanks a lot for your kins answer!!! i know this is a long answer, but i’m learning and willing to challange myself and get good confrontation and advises from you guys :). so thanks!!!
So, the videos will be share before through Patreon an uploaded for now either on Youtube (private link) or as suggested by Patreon itself on Streamable, Vidyard or something similar. (Vimeo is expensive). Eventually I will create my own website platform VOD during the next year, and have to decide if use a VOD platform, Amazon AWS as some web designer suggested, or again something like Streamable.
I followed your advice and shot some videos in 4k 30fps, and also FHD 30 and 60.
I must say that I actually notice the following differences:
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4k colours are more clear and also have so much more the details on the scene (ie. my face etc.)
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1080 60fps it’s visibly more fluid especially when I do body movement and transition (especially in dynamic yoga classes).
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1080 30fps same video quality but less smooth.
also -
4k create monstrous files. for about 60min of videos I have about 40/50 gigabytes of file, which gimme issue in terms of space and how to store it. it’s not only that, these giant files required a lot of times to be copied from one place to another, and a lot of time to be proxied. in FHD I realized I can work without proxies. So even if I was for 4k I have to admit I don’t have the equipment yet to manage it quickly, considering that most of my videos are from 60 to 75 min each. (it’s a yoga class). Eventually, if the business is successful i’d like to go 4k 60fps.
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in terms of light, for now I’m shooting in two places which seem OK: one outside in the yard, in the morning with decent light (I’m in Miami for now) and indoor in an empty living room, using 2 standing light with 4 bulbs each, which seem to be doing a decent job.
I’m really interested in your mention of the G85 having a 28mbps codec. I noticed that checking the properties of my videos. in the following video tutorial the guy is suggesting setting it to set the Mbps to 40 or 50mbps for a 60fps video. as it said 100 for a 4k. I just did some test with many exporting settings on a short video, but I haven’t reviewed them yet.
B-frame: confusing topic. I heard 2 it’s enough. shotcut often offers me three most of the time. I read the highest the better, but i noticed it makes the file much bigger and haven’t notice much of a difference honestly. The guys from the video suggested 2.
thanks for your support. greatly appreciated.
i’d be glad to show you the test I made if you are OK at having a look at them.
anyway a short summary on the best settings to export in
4k 30fps
4k 60fps (for future reference) and
FHD 60fps would be greatly appreaciated.
all this numbers are driving me crazy 
and i need to find a good setting i can stick with and put my effort on another aspect of the job.
best,
Alessandro