Hi all! I've been wanting to get in to this hobby for years now and decided that this year is the year. I watch a bunch of Bonsai youtube channels and have done a fair amount of reading, including more recently some of the great materials provided on your website. I was planning on attending a meeting or two to ask some questions before getting started myself, but that is currently off the table. I'm planning on starting with some raw nursery stock material as my first few plants. However, the one thing currently holding me back that I'm asking for advice on is soil. What sort of basic mix do you all use. Further (and more importantly), where do you source it? I live in Boulder (moved here last fall for grad school). I'm also open to any other helpful tips or tricks, including what species you might suggest as relatively forgiving for this climate (and possibly a bit more shade tolerant). Thanks for your time!