The mistake everyone is making here is assuming that what Peter does is teach visual filmmaking. He does not. Peter is a motivational speaker. He's not selling photography and filmmaking skills to you. He's selling you the self esteem that you can be as successful as he is.
This isn't a popular option, but I'm going to suggest the Panasonic GX85. We shot a feature on it last year, I shot a few shorts on it as well. Same in-body stabilization as the GH5. The Natural picture profile is really nice, so you don't need to drop money on v-log. For $700, you get it brand new with a 12-32mm lens, which isn't a great lens, but it's a start. You can get the camera for $500 used.
For $20 you buy a m42 to micro4/3 adapter and pick up a couple of cheap Russian lenses like the Helios 44-2 58mm and a Panacor 29mm. Together those will cost you about $150. You can get a nice 135mm like the Jupiter 37 for $50. The onboard stabilization of the camera's chip means you can shoot handheld with these and still get a pretty smooth video.
The GX85 has a built-in mic that's pretty lousy but fine for getting audio to sync with a recorder. For $159, grab a Zoom H4N to record audio. Or, cheaper and easier, a $70 Zoom H1, mount it under the camera, and put a shotgun mic like the Rode VideoMic Compact on top and run it down to the Zoom H1.
I have bigger, better cameras (a DVX200, GH4 and GH5), but in certain situations I'll still use the GX85. Its picture holds up to any modern camera and it shoots 4k.