Issues to tackle

So, there are some major issues to tackle if this project is going to be successful.
How will taking turns work? Will one player move all of their units, then the next player move all of theirs, etc etc?
What stats will each unit have? How will they be managed for a board game?
Will there be equipment? How will that be managed?
Each class has different skills, and I want to allow players to change their units classes and equip previously learned skills. Again, managing is a major issue.
Also, how do they learn skills? How many will each class have? How will they work with each other?
Obviously, I have a lot of things to work on for this project, but I'm sure I can get it working together well. I just have to make sure to test my ideas and confirm they work as intended.