Bike is coming out of storage, what should I focus on?

Riding it, I would focus on riding it. To prepare for that, follow the guidance of others above and also check the tires to make sure they aren’t dry rotting or developing flat spots if the bike was left stationary too long.

Congrats on the purchase and hope you get to riding soon. This bike brings so much joy especially when riding (in case I didn’t make the riding part obvious). Welcome to the forum as well.