crew Building a Budget

How much does crew cost? I'm attempting to build a budget for a microbudget short. This will be shot in Oklahoma. My background is from the writing side, and I'm new to producing. The script already has good coverage. I want to pay people and kit fees fairly, but I need to know what to expect as I build my sponsorships and funding streams. This way I don't accidentally underestimate or overestimate my target. Thank you so much for your time.

Here is what I want to have:
camera operator
sound mixer
boom operator
(I have script continuity, director, and still photographer already covered.)