I don't think you are going to find someone this way to fund you in gambling and be your partner in poker because why would someone do it in the first case? If you are good at it you should have win some tournaments and win yourself but you are trying to find someone to scam money from.The rule of gambling says never goes beyond your budget and if you are addicted towards it then you are on wrong path.
It would be better if he tried it himself than having to find a partner to gamble with, let alone someone he didn't know. If he is truly an expert, I don't think it will be difficult for him to win from gambling games, but it takes time and not everyone can be patient in collecting victory after victory. Apart from that, an expert will definitely be able to control himself and not get addicted because he can stay on the right track while playing gambling and getting wins.