character item help

[FMFgaming]

Im making a character And I want him to have a unique lucky whistle (similar to the original lucky whistle) except with infinite durability/uses. im assuming you'd have to make a whole new item but give it the characteristics of the lucky whistle but tweek the uses. I also want to make it so only my character can pick it up and no one else (ive seen other mods do this). and lastly I would also like to give it another name. any help with any of these would be appreciated