A search bar at the top of the application to search any item I want, then it will display how many units of that item we have in stock or deployed. I want to be able to add or remove items easily as well.
Eventually I would like to be able to have a user page and be able to track which users have certain items.
There are many ways to do this. Just as a basic idea to get you going:
I would start with a design idea to get it mapped out on the screen. What pages will look like, where things should go on the screen. Check out dribbble.com for inspiration.
Think about the logic behind buttons and what you need things to do, go to certain pages or display popups, etc.
Think about the database and what you need to store there and how you will attach it to the users.
Think as if you were a user, which steps would need to come first, second, third, etc. Maybe a login screen would be where you start, then go to a dashboard page, etc.
Then start creating it in Bubble. When you get stuck on something, post here and we can see if we can help you out.