First thing you need to do is establish why the piston cooked... If you haven't taken it apart yet do a pressure/ vac test on it first (I'd measure squish for reference too).
Once cylinder is cleaned up & piston & rings replaced pressure/ vac test is a must!
I'd also take the opportunity to give the carb a going over (& check how many turns out L & H were at for reference).
Once all that checks out set carb to factory (probably 1.5 turns out on both) & tune slightly rich for initial running/ milling. Watch a bunch of videos to get an idea, Madsen's has some good directions, & Tom
@Vintage Engine Repairs did a good tutorial a while back. If you're not confident get yourself tach, it'll pay for itself the first time you use it.
After the saws back up & running & you've run a few tanks through it look at your milling setup... Sharpening is critical, so do some reading up on angles, hook, rakers, etc for milling. If it's an option, it will take a load off the saw converting it to .325 or 3/8 LoPro &/or grinding the chain to a Granberg style chain.
Good luck, keep us posted