Looking for beta readers for middle grade novel

I won’t be ready for another month or so, but I’m looking for a few people willing to read one or two chapters at a time of my upcoming adventure novel and willing to give me their comments - as many or as few as you want. No editing or anything like that, mostly just to tell me if my characters are believable and if there are any holes in the story that I’m missing. I’ll return the favor, of course, or will write an endorsement, whatever you need. 😊