Any driving instructors I have a few questions.

[myvision]

I'm thinking of changing career and I stumbled upon some driving instructors courses so for £1k to £1.5k I could be a fully qualified driving instructor. (If I pass the tests).
Are there any instructors on here to answer a few questions?

Weekly income? (Based north lincolnshire)
What's best independent or franchise?
Insurance costs?

Any tips or is this a really bad idea?