I am looking for advice on mapping the inside of the large buildings where I work. I am still trying to understand how some of this data is going to work… I need to know what is the most important thing to remember when tagging the different buildings and levels? I need to add each person’s office to each floor so that people can find their way to and from different offices in the building. I’m having trouble understanding how to implement each and every room into each building. If someone could give me a couple tips it would be greatly appreciated! Thank you!
Hello 
and welcome to OSM!
Pooh! You’ve taken on quite a lot…
But there are good beginner articles in the wiki for your request.
The first is for the 3D exterior representation, the second for the interior rooms and paths. You should always consider both together. Follow the further links for much more in-depth instructions!
A good read should be a good start. 
Have fun with the implementation!
Greetings from Germany
Andreas