Quote from Ivanovich:
What do I, personally, need as a qualification (ie, series 7,etc) in order to manage other accounts (from a regulatory standpoint)?
You don't need any qualifications if your forex market maker business is not registered in US.
There are costs involved with this as you may need to purchase a forex trading platform. The price of it varies, but it starts from about $10k downpayment plus the company that sells it to you may want a cut of your profits.
On the other hand as a market maker you could take the other side of your clients transactions or give them up to a clearing house. Also you would have an incentive to place lots of trades. So you could still make money even though your clients are not.
To be honest a see a huge conflict of interest here ... I'm not sure how much your clients would like that.