Sewer scope cable length

I am planning on adding two services to my offerings and I have a few questions that I hope someone can answer. First is sewer scoping. (Going to take James Krumm’s course). I am in the mountains in Colorado and want to know what would be the minimum length of camera cable I should consider. Also, is it wise to pull toilets if no cleanouts are accessible? I’ve heard some do and some don’t.
Next I want to perform well inspection and flow testing. I have taken the InterNachi course on this subject but I thought there was a glaring omission in that it did not outline the actual steps to determine the well production rate. I have done research on this but is there a definitive source for this information. Thanks for any info.