Hi Sue,
Welcome.
First let's try something simple. Remove the negative cable(Black) from the battery then the positive cable(Red).
Next mix up some baking soda and water to form a paste. Spread this paste over the terminals and the top of the battery. This will neutralize the acid. Don't forget to do the cable ends also. Once it stops foaming you can rinse it off with water. When you reconnect the cables just do it in reverse order with positive then negative. Also put some petroleum jelly on the connections to prevent corrosion.
Next and this will involve spending a little money but not much. Unless you know someone that has a multimeter. If not go to a Radio Shack or an electronics store and get a small digital multimeter preferably one with autoranging.
Then you can check the voltage on the battery to see if it has at least 12 volts in it.
This should get you started and just post back for more help after that.
Shadetree