(disclaimer: I'm a trans woman who has never used a chest binder)
I've heard good things about tomboyx as a brand - though I think they can be pricey.
here's a cute, introductory comic about binding:
https://www.ohjoysextoy.com/binders-jey-pawlik/
I think the most important parts from the comic I want to highlight are:
- binding can be a health risk, and it's important to never bind more than 8 - 12 hours at a time
- when binding, make sure to stretch every couple hours
- to have at least one day a week in which you don't bind at all
- to never bind using tape, bandages, plastic wrap, etc.
- make sure the binder you wear is not too small and not compressing too much
I don't know much about the health risks and mitigation strategies for binding, so I recommend doing a lot of research up-front.
Much luck!