If they find out that it was a prank you could get into trouble. Give the address, include building number, apt. Always remain calm and try to give direct answers to the questions asked. Speak slowly and clearly. You will be asked additional questions so the dispatcher can send the right type of help.
All questions are important.
You can also do this at places you visit often such as grandma and grandpa's house. Always do as you are told by the person who takes your emergency call.