I’ve used Finale for 40years. Is there a resource for someone who has no idea what anything is in Dorico to learn? I’m talking for real dummies: What is a player? What is a flow? How do I start a project without opening a template?
Welcome to the forum @contefamily!
There’s heaps of resources. Some places to start:
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Welcome to the forum.
A player is someone who plays an instrument- but perhaps they swap instruments mid-piece? (no problem, Dorico will handle it)
A flow is just a chunk of music. A Beethoven sonata may have one flow for each movement. A Song Book may have one flow for each song. An exercise book may have one flow for each exercise.
To start a project without a template try File>New.
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Some Dorico learning references here
There are many Finale to Dorico users willingly wanting to help others by actively answering questions here at the forum. Please feel free to ask questions. You can also search for threads 
because other Finale users transitioning have had to ask questions.
You will be frustrated because it is a different software program to learn, we all understand, as most of us have come from other notation software and had to spend time learning Dorico.
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Not sure Finale has been around for 40 years. Close, but not quite.