>>2729529Talk to your team lead for whoever you plan to volunteer for and see if they offer training. No sense in paying for training independently for what they might provide for free
Otherwise, depending on your location, you might be able to find a place (usually a tech school) that teaches S212 (Chainsaw Intro) certified via the NWCG. I'm not aware of any classes the FS teaches to the general public, by the time I got my saw certs with them I was already signed on as full-time fire. Maybe they have some.