Start small and avoid futures.
That's the best tip that you can give to your friend if he has no idea of what he's doing. Learning from YouTube videos are fine but that's not enough for futures trading. It's a combination of many factors and experience will tell more for that friend of yours. That's why even if the others are lurking here, you shouldn't get into futures with that $1k. That's a huge amount to lose unless you're prince of saudi or sort of royalty where you are or simply rich.