After the registration you have completed the indispensable, but there are many other things to pay attention to.
 

 
Spanish Social Security Number (Número de la Seguridad Social)

In order to participate in the Spanish social security system you have to pay a contribution every month. The payment should be made by the company that has contracted. This contribution usually entitles you to retirement and unemployment benefits, sick pay, maternity pay and free healthcare. The amount of retirement or unemployment benefits will depend on the level of the contributions you make during your time in Spain.
Once you take a job in Spain your employer is required to register you in the social security system and to deduct any contributions payable by you from your wages. However, you will have to apply for the number yourself.

In order to obtain a Social Security number you have to go to the nearest Social Security office with your NIE and your ID card or passport. There are several around the city. More information (in Spanish) at http://www.seg-social.es/Internet_6/index.htm 


Local Registration in Spain (Empadronamiento)
 
Getting empadronado means to register at the municipality you live in and should not be confused with the residency. Local registration makes you an official member of the municipality and provides you with many benefits on a local level: personal doctor at the hospital, right to vote, right to sign your children up to a local school, discounts at several leisure centers in the area etc. It’s a win-win situation: the community also benefits from your membership because they receive funds based on the number of inhabitants living within the municipality.
 
You can achieve local registration at Ayuntamiento (Town Hall) or Junta Municipal Del Distrito (Administrative Office of your neighborhood). You will be given a form to complete. Besides that you need to bring your passport, NIE and some kind of verification  that you are living in the area (rental contract or signed document from your landlord).

The volante de empadronamiento is free, but to obtain an official certificado de empadronamiento, you may or may not have to pay a fee, depending on where you live. In most cases, the volante is all you’ll need for official procedures (trámites) when working with the local bureaucracy. The official certificado is generally only needed as required by national or foreign bodies.


Bank account in Spain

There is a huge amount of banks operating in Spain. How to pick the best one? First, pay attention to their distribution. In general, the stronger presence in Spain, the better. Second, look at the tariff rates. Commissions vary significantly. Third, make sure that you can reach them when needed. In Spain most of the banks are open weekdays till 2 pm, only some have extended hours.
 
To make sure that your account will be opened immediately,  bring the following documents:
 
-          Passport
-          NIE number and certificate
-          Proof of occupation / status (work contract)
-          Proof of address (rental contract, utility bill)
 
With these documents and if aged over 18 you should not face any troubles. However, if you want to make sure to make the process as painless as possible, go directly to any of the La Caixa branches: they should have at least one employee per office who speaks English and they are used to taking care of foreigners’ accounts.