Don't crash the ambulance.
If you don't know how to do something don't fake it! Ask for help.
Don't be lazy.
It's not your emergency so calm the heck down.
It is extremely rare that something is truly so life-threatening at a couple minutes will make the difference, so take your time, be methodical, ask questions, listen to the medic's assessment, talk to them after the call asking them what they want you to do and if they have any feedback.
Bring a smile to work, show up early check off the truck and have a good time!
Also, if the medic is trying to nap please don't bombard them with questions. We had a student the other day that chattered non-stop for the whole 12 hours. Usually I'm happy to have students or new employees on the box but the shift after a shift that we got off 3 hours late from is not the shift you want to end up riding along on. It's understandable that you are excited but you have to realize these crews do this full time as a career and sometimes they need a chance to try to catch up on some sleep, hw, reading or something of the sorts.