@jerbear1969 you have a lot going on with your Toyota. First rest assured that you cannot reverse the polarity of your battery with a wrong charge etc. Not possible based on the way ta battery is designed. You may have issues with the meter. So you replaced the battery and your car started but no power options until you replaced the fuse. Now the lights etc. work and your car starts but immediately stalls again. That does sound like a fuel issue but since you repalced the battery try to re-teach your computer. Se if this will work for your Camry
1. Pull your parking (emergency) brake. (Brake on) Add additional chocks to prevent your vehicle from moving
2. Start the engine and step on the gas steady around 800 RPM. (with your right foot)
3. After 15 minutes, do all these at the same time: Step on the brake pedal (with your left foot), put the transmission shifter in DRIVE (D) with the RPM steady at 800 RPM. !!!!MAKE SURE YOU HAVE YOUR PARKING BRAKE AND CHOCKS APPLIED TO PREVENT YOUR VEHICLE FROM MOVING!!!
Do not let the idle fall below 800. Keep it at 800 RPM for around 15 minutes..
After this your idle should be back.
If that does not work then you will have to check the fuel supply. Check to make sure that your fuel pump is working and that you have pressure on your fuel lines. Get some throttle body cleaner and clean your throttle body and IAC valve.