Ask HN: Consulting the right way?

I partnered up with a friend to consult in web/mobile/creative. We have a bunch of clients and it's very unorganized and makes me nervous. I do this on the side along my current full-time job which I'm looking to quit once this takes off.

1) How do I prepare a proper contract for a simple freelance job ?

2) How do I handle payment and invoicing? I don't want to do it for just cash. We agreed to invoice it under my name for now, but how do I deal with the tax implications of this extra money (I'm in Ontario, Canada).

3) I remember reading about this 17 year old kids consultancy on HN once but I can't for the life of me remember the link.

Are there any good blogs HN recommends to follow in relation to consulting/freelancing? I only know of the close.io blogs which are great and patio11's work.

Thanks.