I second what Scrappile just said. First of all, we all have had a lot of firewood. Sadly, I have no fireplace. Second, wear a dusy mask no matter what you are cutting. Scroll saw make a ton of fine dust. Many of us have a 20 inxh box fan sitting along side of us to draw the dust away. Put a furnace filter on the inlet side. Make sure your dust blower blows the dust away from you toward that fan. I vacuum off the furnace filter after every session. It's amazing how much it catches. 3rd, Rockytime buys sheets of under layment plywood ay H/D for just a few dollars. It's about 3/16" thick amd seems to cut well.
And, 4th, do tell us a bit about yourself. Welcome to the village. It's the friendliest place on the web.
5th, no such thing as a dumb question!!!