Don't play rough with him, especially with bare hands. If you do, he will learn that biting is fine, and he will learn to be aggressive with you.
As the newcomer in the area, he is a threat to the other cats and of course they will defend their territory. You might want to keep him indoors to prevent serious injuries later. If he isn't neutered, he will likely start to fight with them very soon.
Jean Hofve, DVM
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