This really depends on your patient panel and location. If EMT coverage/hospital access is far away, you may need different equipment than an urban practice located near a hospital.  And your patient panel will determine the size/type of equipment.
Three guidelines to consider regarding this purchase:
Don’t “over buy” a kit where you have no idea how to use the medication/equipment included (this goes for being up to date on how to use it)
Keep your kit in a prominent, easy-to-access location that everyone in the office knows about
Assign someone to be responsible for periodically checking all kit items to make sure nothing has expired and that all equipment is operational.