I think Kotlin would be an excellent first language. Python would be as well. I would shy away from JavaScript as your first language It is not a well designed language, and has many oddities that confuse even experienced programmers. It would be too easy for you to pick up bad habits that will negatively affect you later.
Now as to your concerns, I think both JavaScript and Python have bigger communities, but Kotlin’s community is active and growing. You should have no difficulty getting answers to questions, but straight up web searches may not be as helpful since there is less material out there right now. Second, you don’t need to know Java, but it can be helpful. Since Kotlin maintains compatibility with Java, Java influences Kotlin.
If you are brand new to programming I would suggest the Atomic Kotlin book. It does a good job of starting out with simple concepts. The Big Nerd Ranch book is also good, but somewhat out of date for more advanced topics like coroutines.
I hope this helps, and good luck no matter your choice.