bower4311
ArboristSite Operative
Since you are new, I would keep the chain you have on it and spend the time learning to keep it out of the dirt and learning to sharpen it before investing in more chain. You are in the PNW, so chain is cheap there and easy to come by when the time is right. That saw likely won't need skip chain unless you do plan to run it with a 20" bar or happen to bury it in a lot of fir(skip is not only just for bar length, but also to clear chips while keeping the revs up). Otherwise, I would spend as much time with your more experienced bud to get some pointers. If that saw came with 3/8, stick with 3/8. Most of the wood in the PNW cuts perfectly fine with a 3/8 on a 50cc saw.
And I think 3/8 is a little easier to sharpen when first learning.