New to the Mazda scene

Ok so here's the deal. I recently bought an 06' Mazda RX8 from a used car lot. All my previous cars have been hondas and acuras so you can say im new to this make and model. When i picked it up of course i paid no attention to the check engine light that was on but now it has me a little concerned. My daily commute of about an hour and a half over an about 8% incline hill is feeling like it's taking a toll on my car. I say this because of the fact that the code came back as a misfire for the CEL and last night my coolant level light came on. I live in about 95° weather so idk if that's the reason i had some leaking from the radiator cap or the obvious lag when getting to work or if it really is misfiring and causing real damage. I obviously want to get this fixed asap so anyone with a similar experience please help me out. I will add that when climbing the hill it doesn't go higher than 3/4 temp but like i said before im not used to this and want to take care of my car as much as possible. Thanks 👌

New to the Mazda scene