Welcome to the world of Bonsai, @MagicMike !
There are plenty of people out there growing trees from seed, but that is an exercise in patience at the very least. I totally agree with @Micke and @Bonsai_Bentley, except, maybe, for the “get as many” as you can philosophy. See some of the discussion in the post below;
Another day. Another trip to the nursery
I do encourage you to get a few less expensive trees from your local garden center, nursery, or big box store to apply what you’ve already learned but not so many that you can’t manage them. Dig hard into the archives of streams and Q&As that apply to the species you are most interested in (definitely recommend becoming a top tier member of Mirai) and then, when you start having real success, go and find some bigger or more developed trees (read more expensive) that you can focus your efforts on. You will be rewarded with better looking trees and a better understanding of the species you have decided to focus on.
Bonsai on!