I'd be weary of anybody bringing clients from his current employer. Someday, he'll have enough hours to be his own master, and take 'your' clients with him for his new business.
I was a juror in a Federal Court where something very similar happened. Two guys formed a business, one knoew the work the other was the salesman. The salesman learned the trade tricks and started his 'own' business. He grew very quickly in two years. (Commercial swimming pool builder.)
He did advertise across state lines, thus making it a federal offense. They did no work out of state but since they used the US Post Office to send out flyers, it was considered a federal offense. He'd claimed to do all the work in the flyers when in fact they were pictures of the work he did while partnered up.
He's in federal prison now on several counts.
I read up on partnerships alot before jumping in. I'm sure there are some good references that will spell out most of the pitfalls and how to avoid them.
