Should I create a business for the side work / consultancy work I am getting?
I'm getting some rather serious consulting work on the side of my main job.  Serious in that I'm filling out NDAs and service agreements for the small-ish company I'm being contracted by. The guy I'm getting the work from wanted to know if I had a business to associate the work/payments/contract with, and when I said no he somewhat recommended it - but with no real reason.

So, should I start a business for my consultancy work?  What are the advantages/disadvantages of that?  Corporation, LLC, what?  How much paperwork, time, and money is it to start a business?  (I'm in the USA)
Should I create a business for the side work / consultancy work I am getting?
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I'm getting some rather serious consulting work on the side of my main job.  Serious in that I'm filling out NDAs and service agreements for the small-ish company I'm being contracted by. The guy I'm getting the work from wanted to know if I had a business to associate the work/payments/contract with, and when I said no he somewhat recommended it - but with no real reason.

So, should I start a business for my consultancy work?  What are the advantages/disadvantages of that?  Corporation, LLC, what?  How much paperwork, time, and money is it to start a business?  (I'm in the USA)