Well, I don;t know much about training a fish nor do I have any links but I would suggest getting to know your Oscar first. I don't know how long youv'e had him but as with training any animal, they need to know you. With fish, I'm sure it would help if he could recognise you as his keeper. With my fish (not Oscars) I like to put my face up to the glass to where they could see me. I'm sure you have witness 'begging' for food, it's like that but all the time. I put my face up close on one end of the tank and they rush over to see me. Then I go over the other end, and the rush over that way. It's really quite cute! Then I feed them. I do this every day. However, when anyone else puts there face up to the tank they don't know them, and don't foll9ow them! Anyway, I'm sure it would help to make your fish comfortable with you before you go Training him.