Well, DO YOU, Pilgrim ??
Welcome to the funny farm.
Where abouts in the world do you live ?? maybe there is a member close enough to drop by and do the shake out run with you ??
I would start out with a log about 12" across or so. 8' long is also good.
Have you had the mill lined out ?? Adjusted, set up correctly ?? Can't believe WM did not offer a couple hours of instructions, seein as how ya got logs.
If no pre adjustments were arranged, forget about sawing that first 12" log, until you do some reading in the manual. You DO have one-o-dem, correct ??
First thing I would do, is, stretch a string real tight from the closest bunk to the farthest bunk and see if ALL the bunks are exactly the same plane. Check in 3 widths of the bunks, so one side isn't different than the other.
If all is well, then, find something VERY lightweight and straight, like a 12" plastic level or similar. Install a blade, correctly,
, and lay the straight thing gently ON the blade, as it would be cutting. Move the sawhead to the first bunk and carefully measure the height from one end of the straight thing, and then move so you measure the height from the other end of the straight thing. IF they are exactly the same measurement, you are good to go. If not, ya gotta adjust the blade guides to have the blade exactly level with the bunks.
The blade should have approx. 1/8" of down pressure from the guides, and, the flange on the roller guides (you DO have roller guides, correct ?) should NOT have the blade touching the flanges when running and NOT cutting. That should also be about 1/8" or so, from the back of the blade to the flanges. Rollers need adjusting, also, in a different way.
Give us some info, and, MAYBE, you can start sawing that first log, more quickly, IF you DO have everything adjusted.