black soldier flies

I want to change to BSFL as a staple. I only have one bearded dragon and she's an adult. I'm wonder what a good quantity is to start out with and how much she should eat in a week? I don't want to run out quickly, but I don't want to end up with a bunch of flies either if she can't eat them...

I'm talking about the actual black soldier flies and not the BSFL. My beardie loves eating the flies but can't find much infomation on if they're a staple and healthy or should be avoided. Please let me know what you think! Thank you in advance! <3