Your hours at the fire station would not be counted as hours, unless if you are at the fire station to respond to EMS calls on the ambulance. I can sit here all day and talk about how FFs (with the exception of FF/EMTs, or FF/medics) who are on scene as a FF on the engine do NOT do any clinical work- the closest thing to clinical those FFs do would be helping with lifting for EMS on scene (on some cardiac arrests/trauma codes, I've had FFs do CPR, but that's few and far in between). Absolutely no hate on FFs, all first responders have an important job, as a FF on an engine, I can't imagine any of your calls will involve anything remotely clinical
For example- I am a volunteer EMT at a local fire department, but I am only there for EMS calls. Therefore I count my hours towards clinical because I am there for emergency medical calls, and to treat my patients. So if that is what you mean as your time spent at the fire station, then sure those hours count.
If you want to do Fire 1 because you are interested, go for it. Don't do it because it will enhance your applications or count towards clinical hours.
I will echo what others have said, but it is different everywhere. Where I work, we have paid and volunteer EMTs. Most places want paid EMTs who have about 1-2 years of 911 experience. However, if you volunteer at a 911 agency and you are a good EMT/have a good reputation, they will hire you with less than 1-2 years of experience (we can hire consistent volunteers after a few months)
As for the driver's license, you do not need a driver's license to be a 911 EMT. AND if you are brand new to driving, I would not recommend driving an emergency vehicle- driving lights and sirens is EXTREMELY dangerous. You can ride as a second (aka the 2nd EMT in an EMS crew) without a driver's license, you will just always be the treating EMT and writing the charts (which newer EMTs will do regardless because you need to gain experience)
Also please stop calling it an "ambulance company" or "911 ambulance" its EMS- emergency medical services, call it an EMS company, "ambulance" companies are usually transport companies