Hi,
Welcome to Terrazas.
Travel time to Terrazas from Alicante by car is an hour.
Travel time from San Javier Murcia is 17 mins by car.
There is a train station at Balcicas which is only 5 mins by car from Terrazas.
Most people on the complex rent a hire car if they do not have one of there own.
Another option would be to have a keyholder for your apartment who will meet & greet you from the airport, & would put a welcome pack in for you until you can get to the super market on the complex.
We have someone in our block who gets picked up from the airport by taxi, who then takes them to do a Mercodona to a big shop & then gets them to the complex.
People on the complex are very friendly & will help one another out, get to know your neighbours.
Regards
Clieve