I am wondering what I should be looking for once I get my hives to see if the bees have any diseases or mites
Experience.......
:D You need to go into them weekly or semi weekly and just look things over. Soon a pattern will develop and you will take note of changes or things you read about.
what you should look for is a seasoned beekeeper to steer you in the right direction.
https://agdev.anr.udel.edu/maarec/honey-bee-biology/honey-bee-parasites-pests-predators-and-diseases/
Also you should look for the queen age, if is old, hairless on torax and have torn wings must be replaced.