I've been on an on-call dept for 11 years and I'm a Captain. No worries about the fire academy if you have decent intelligence. They teach it at a 10th grade level (and that's being nice). I went through the fire academy while I was working 2 jobs plus going to college. Could be different in different states, but I'm in Michigan and that's how it is here. Here at the end of the academy you have to take a state written and practical exam at the end.
here's my advise:
1st and most important, when you are in your station, find the senior guy that knows what he is doing and hold on to his coat tails. (He'll be the guy who doesn't talk trash about the things he's done, but you can see it on his face that he's "been there, done that".
It is one of the greatest brotherhoods to belong to. If you are around a group of guys such as what I have at my dept you'll love it. We laugh and joke about everything you can imagine and especially on each other. When we get done with a call, you'll find us all sitting around the station for an extra hour just bullsh!tting.
Hopefully your family life is stable and those around you will support your decision. Cause you'll have nights of being out fighting fires all night long just to go home, take a shower, and head off to your regular job. Hopefully your employee will be understanding on those days too.
When you have free time, go to the station, look in every cabinet of every truck, learn where every piece of equipment is, practice getting your gear on and jumping in the truck and then donning your air pack. Nothing worse than a rookie on his first structure fire who can't get his gear on in time and you have to stand with the nozzle at the front door waiting for him. So you want to practice so many times that when you jump in the truck, it's 2nd nature to you and you don't have to think about it.
Also, your first year, you'll be called rookie or probie, get used to it, we all had to go through it. Sweeping the floors, cleaning the toilets, and every other job that sucks. But no worries, you'll know the guys accept you when you earn your nickname.
Now for my morbid side:
Remember, we lose over a 100 of our brothers every year. As much as we might joke around, you must also remember this job kills. If you are going to do it, then do it all the way, there is no partial dedication when you are in a fire with flames up your a$$ or when that person is trapped in the car and you're the one with the tools in your hand and that persons life depends on whether or not you get them out.
You will also see things that you will never be able to get out of your mind. Some people have a problem when they see dead people, some don't. I have many very visual images stuck in my head that I wish would go away, but that's the price you pay to do the job.
The job isn't for everyone and there are a lot of people on fire depts that aren't firefighters even though they have a certificate that says they are. Some, no matter how long they are on a dept. will never get it, those who do understand, know that we will walk through hell to save one of our own.
Well that's my rant and rave, sorry if it's too dark for anyone.
But I will leave you with my favorite quote from Dennis Leary in Rescue me.
"You won't find any medals on my chest, cause I ain't no hero, I'm a fireman"