Be aware that daytrading is a losing proposition, most end up losing it all. Invest long term. Most charge 2/20% or 30% on profits.
On the IB friends and family account you can setup management fees, etc that will be transferred directly from their accounts to yours.
got a question on ib's friends and family account. say you have two accounts under management. you buy 1 share of XYZ. how does the trade get allocated?