legalities with spotting

Hi, have read both Steves books on investing and have booked into the masterclass end of Feb. Have also read all the current Q & A re spotting and will checkout the US data on this topic. I do have some questions for the local market though.
1) In NSW do you need to be a buyers agent to do spotting? If yes what do you need to do to achieve this?
2)What is the standard fee charged by a spotter?
3) Does this fee change depending on type of property?ie domestic, commercial, development sites
4)How do you protect yourself from being bypassed on the deal?
4) I have been told there are contracts you can have set up with a client that you are spotting for that covers all properties you pass onto them but it seems like you would be paying alot in solicitors fees to set this up and would only be worth while if it was a continual steam of properties that you were supplying to them. Is this neccessary? I know a guy who told me he paid a solictitor $11,500.00 to put together a template he could use with developers and individual clients to cover himself and make sure he was paid on the properties he passed on to them. Does anyone know a more cost effective way to do this?
5) Is spotting and flips the same thing only one you sign the contract and have a or nominee clause on it? Or if they are different do you need anything legally set up re being a buying agent to do flips? what is the upside and down side on both?

What a barrage of questions, the more you learn the more you realize how little you know

Thanks in advance guys and cheers Sue