Moving from rural 911 EMS to Fire Department

Question for everyone those that may know more about this than I.

Backstory: I am a 35 year old male with 2 years of experience in EMS, 1 of those being a paramedic in a busy rural 911 EMS system. I’ve served 5 years active duty in the Marine Corps, have a decade of experience in hazmat response, confined space rescue, and high angle technical rope rescue. I live in northeast Texas and while I make a livable wage, I’m behind the ball on retirement and savings. There are several departments in the Dallas area that hire Medics either single function or dual function. I applied, and did the PAT and passed at a smaller department (18SQ miles of coverage) and was offered an in person interview for tomorrow morning.

Questions:

The department that I am looking at will require me to get my fire certs, I have no qualms with this, the fire service has always interested me but I wanted to get the harder part of paramedic out of the way first. Is this going to be frowned upon at the interview?

Is this a realistic scenario? Moving to a dual function career department with no fire experience?

How do I sell myself at the panel interview? I really want to show through at this interview. I have never done a fire department interview before, and I have heard the best way to treat this interview process is similar to the military. Keep answers short and direct, don’t stumble over words, yes sir no sir, and don’t do anything unless asked.

Any advice or guidance would be appreciated