I have just started into milling my own lumber and you will definitely need to choose the right saw firstly . From what I found , the harder the wood the more powerful saw your gonna need.
My first shot at it was 2 weeks ago . The wood was 24" width of red oak 8 feet long .
The setup I am using is a Stihl 084AV , Granberg edging tool and the 24" Alaskan milling attachment. Had to narrow the trunk to get it to fit in the milling jig tho. Lesson learned. Also a note , if you decide to use one of the Alaskan mills , I would highly suggest purchasing the winch attachment as well. What a back saver and make sure you have wedges.
So the end result was 18" x 96" x 1" planks. Took a half tank of fuel and 3/4 tank of bar oil.
Again , lol mileage will vary depending on what saw , what chain , and what type of wood.
I was lucky selecting a saw because the guy that sold me his was already milling with the saw . You want a saw with a lot of torque with plenty of rpm left .
I also saw on this forum to run the saw a little wet (rich) . Hopefully some of this helps and that someone else can verify that I'm giving you the right info. Good luck
I also use my Stihl 084 for regular felling of trees . It's a beast , so when there's any doubt about making sure I get my cut thru quick to drop the tree , it's my go to saw. So also keep that in mind. Multi-purpose saw , not just a milling saw.