When it comes to how often your snake gives you the oh-so-wonderful (lol) number two it varies. If they are eating regularily you can get it once every 2-4 weeks.

Since you say he wasn't eating at first, it would make sense he wasn't leaving number two's. You only get out what you put in

I have no clue on douglas fir bedding, but I have used shredded aspen before and it works just fine! Just make sure he doesn't ingest bedding with his meals.

Sounds like your doing good so far and congrats on your first bp!