I read your post and I get concerned... Here is why... Governments don't take it lightly when you just manage people's money without any regarding to regulations. I am taking my portfolio manager license for Canada exam because I want to make sure that the law or intent is on my side.
For the most part the law does not care what you do. It cares when you do the following; advertise, and bugger up.
IB has a friends and family account which means that for the most part for a few clients you can manage money and be within the confines of the law. Most countries will "close their eyes" and not go after you. The idea is that they want you to be able to start without having to do all of the paperwork.
For example in the US I think you just have to take a simple exam, and registeration and you may manage money up a certain amount.
When you get above a certain amount and IB will indicate that to you, then you need to get regulated. Then it is not optional and you better get your ducks in a row because if you screw up you are going to jail.
One of the loopholes people use is off shore brokers. People think then you are not subject to the law since, well the brokerage is offshore. Fine, if you happen to be living offshore as well. BUT if you are in one country, and your client is in the same country then in the eyes of the law you are breaking the law. Look closely at the Stanford case for that. Thus if you and your client are in the US you are subject to United States law, no and's, if's or but's...
Remember this, if you want to make this as a profession stay on the up and up, as you might be burning bridges down the road. And it is not that difficult to start... Just a bit of studying, and a bit of registration. That is IMO not too much to ask.