If you are thinking about moving to Spain on a more permanent basis then you may want to look for employment. Employment agencies are few and far between in and around Torrevieja, so it would be best to look in the local papers such as the Costa Blanca News and send your CV to companies you are interested to work for.
Spanish employers are generally very accepting of foreign workers. The contract laws are very strict and workers are heavily protected from exploitation. Ensure that you receive from your employer an official work contract and read or translate it carefully. Temporary contracts are for 3, 6 or 9 months and after this they cannot offer you another temporary contract; it has to be permanent or not offer you one at all.
The wages are generally lower than the UK, however your cost of living in Spain will be lower and the lifestyle is better. Your employer will take care of paying your national insurance and tax, this will be deducted from your wages. Income tax in Spain is now around the same rate and scale as the UK.