I’m looking to buy things to set up my home here

Your nearest big shopping centre is Espacio mediterráneo just outside Cartagena. There is a carrefour, primark  JYSK, Casa and electrical retailers. There are also quite a few chinese shops on the trading estate there.I think you could probably get most of what you need there in one big shopping Trip!. Otherwise its IKEA in Murcia for random things you never knew you needed 😉. 

Have you tried Amazon.es ? 

I have 2 single beds with headboards, mattresses and bedding that have been rarely used, and a TV cabinet, but I'm not over until mid-August. I'm in San Pedro.

Thank you for your replies.  I now have beds, saucepans and hooks that I didn’t know I needed!