Newbie Q- What lens for instructional video for A7r2

[hitechcobra]

Yes I'm a complete newb so please be gentle. Need advise on what's the best lens for the job. We are set to film instructional videos. The format is kind of Bob Ross style with close ups of mixing paint and full body shots of artist. What lens is best on a budget and what lens is best overall? Equipment we currently have:

1. A7RII with Tilta cage
2. Sony FE 50mm f/1.8 lens
3. Sony FE 28-70mm f/3.5-5.6 lens
4. Freeworld F5 4k monitor
5. Audio-Technica AT897
6. Misc items like backdrop, Konova k2 Slider, etc...

[hitechcobra]

Maybe 12mm?

[hitechcobra]

Researched all night and discovered “Cine” lenses. Man this is getting real. Starting to realize now how broad a subject this is. So I’m tweaking my question...

What photo lens, which budget Cine lens and which premium Cine lens (maybe like a Zeiss Compact Prime CP.3 Cine)? If an expensive Cine lens is the best option, who’s the best online lens rental?

thanks