It's my first year burning a wood stove. I can get a fair amount of free wood for burning next year and I'm wondering if any type is okay to burn in a stove? I know hardwood is ideal but if I come across some "less desirable" type is it fine to throw it in the pile? Does softer wood damage a woodstove or the liner? Also, my family (burning in a fireplace) often cuts small fallen trees and does not split the wood (too small in diameter). Does split wood burn better than just small logs? Thanks!