You have to be cautious not to put much faith in those who would offer you an easy way to make a lot of money. The more enthusiastic they are about your chances, the more likely they are trying to deceive you. There are few opportunities to make money gambling, and any expert who really knows what they're doing will honestly tell you that it's difficult, and takes a lot of discipline. Unfortunately, even then there are many schemes and theories that are completely devoid of merit (such as martingale betting systems, or any effort to beat unbeatable games like lotto, baccarat, or roulette).
If you want some realistic advice, examine the writings of David Sklansky, or visit www.twoplustwo.com
I would honestly also tell 98% of people not to bother. For most, it's easier to make money working a job then playing a gambling game. If you ARE going to do it, you just have to be ruthlessly self-disciplined