Big shopping complex/shop where i can buy anything from shampoo to a stone bbq and bed linen and towels etc

Camposol for consum supermarket. There is a shop called branded for linen and towels. Big chino shop sells everything but alot isn't good quality. They are the nearest to you.

Mazarron town has nice furniture store mueble 

Garden centres sell signs. There are 2 on camposol and 1 at country club which are near to you.

Further out you have big shopping centres in Murcia for Leroy merlin ( like b n q ) and IKEA etc or shopping centres at Cartegena and La zenia to name a few

Amazon.es?

Nueva Condomina Murcia and Thader both large shopping centres 
 

There are plenty of small local stores in Mazarron & Puerto Mazarron that are actually very competitive on price with the big 'sheds'.

Quite often these small stores will deliver your purchases the same day.

Chino shops have the ceramic tiles to spell out your house name…try Espacio Mediterraneo or La Zenia Boulevard for every shop you need!