Consider the legal risk that is associated for managing those possible clients funds. Do you have all of your licenses and regulatory certificates in place? Are you fully certified? Are you insured? Are you an independent representative for a broker? What guarantees are you offering in your contracts for asset protections? What is the legal ramification if you lose all of your client investment capital? I could go on for quite some time about the things you need to consider.
Also is the question of 'WHY' do you need to manage those funds in the first place? Are you looking to increase your income levels? If so, 'WHY' do you actually need the outside capital. If you are truly a talented and professional level trader, then even with a very small investment of perhaps $1000.00 USD of your own funds, could easily grow into a fairly substantial sum in a very reasonable amount of time.
What's your end goal from the investments?
If it looks too good to be true, it's probably a scam! Let the buyer beware.