As far as fuel mix goes, use whatever you normally use. S'gonna be drinking that it's whole life so might as well start it on the cocktail you plan on using for the life of the saw.....
As far as break in, I personally like to make sure the cylinder is hot to the touch the first half a dozen starts or so, but that's just me and honestly it's not all that necessary. As far as how to run it - run it like hell. No need to baby the snot out of it, it'll be fine. A lot of people get paranoid with "breaking in" a new saw. I have no clue why. Everyone does something different - from a heavy oil mix and not letting it cut at over 5,000rpm for the first two tanks, all the way to guys filling them up with 50:1 dino oil and not even waiting for it to warm up on the first fire as they start to take down a huge oak tree.....
Hate to say this but there's really no right or wrong answer here. Saws aren't 100% ********** proof, but I'm pretty sure the engineers who get paid an ungodly amount of money to design this stuff take in to consideration that there will be much douche baggery going on when no one follows the manufacturers suggestion of what oil to use and how it should be mixed or hoe the saw should be run. Most dealers usually tune the H out a bit just to keep it rich so the saw is pretty idiot proof and after a few tanks you go back in and they turn the H in a half a turn then your saw runs for a long time with generally no issues with the P&C due to improper break in techniques. I have yet to see a thread about someone's cylinder blowing up because their fuel ratio was wrong on the first tank, or because they didn't let it idle long enough during the first tank before using it to cut with, or because they didn't baby it enough.....
You'll hear lots of arguments of what to do and what not to do. Just know that your saw will be fine no matter what you end up doing, unless of course you put to test the woods I just said and mix up a fuel ratio of 200:1 - which is something I would advise against doing by the by.
Boy oh boy am I ever gonna get some **** thrown in my face for making this post. The hounds will certainly be let loose on me for this one.
Get your gas can, fill up yer 395, and go cut some wood.