The problem is that very often, especially with the first inspection, a lot of previously unknown problems are undetected. I've seen a lot of first annuals cost owners six or nine thousand out the gate.
Without anything but the inspection, you can plan on a general range of between six hundred and twelve hundred dollars, ballpark.
As a general rule of thumb, I usuallly recommend spending your fuel cost per hour as a mx cost per hour. However, that goes out the window very quickl the first time you swap a cylinder or have anything that costs.