Jacobo Armero maintains a blog page with thoughts and comments on the new AVE train line here: http://zonalevantealmeriense.blogspot.com/
He pointed me in the direction of the new ADIF page updating people on the Almeria – Murcia connection, which is here:
ADIF say (no idea if it’s true, let me know) that they have an information point in the Murcia del Carmen train station for the Almería AVE. 9-14 and 16-19 weekdays, it seems.
Do you have a more detailed map of the AVE?