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.