Brother,
I suggest you one simple litmus test.
Donot afraid to ask the people to show their contract notes based on their advice. As per my experience in this field for last 5-6 years none of them have dared to show their contract notes. It clearly shows that they are in search of people who are less knowledgeable to cheat and earn.
Donot believe people who advise what they donot do. Its purely a fraud.
There are numerous leaches to suck your blood in this field. Beware!