I need an accountant to help set up self employment

You might to start by reading this.

http://www.exteriores.gob.es/Consulados/LONDRES/en/Consulado/Pages/Visas.aspx?fbclid=IwAR0xMqhqHmEKBIff9XqYT9E6SLp-1cfG5WQqDfxajoVj2zCNqoLX8WqmZt0

And then there's form 036.  

Corto 036 - YouTube  

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You'd probably be better off looking for a Gestoría than an accountant (Contable) as gestoriás deal with all the legalities of everything including the financial and tax side of your business.

Hi

We recently used a great comany in Puerto de Mazarron.  We didn't need help with any self employment but they helped us with tax returns. They also arranged for our Wills to be drawn up a Notaria and gave us help and advice on many other things completely unrelated to tax issues.  They speak English and they were highly recommended by friends who are self employed here and have used them for many years.

https://luciamartinezeconomistas.com/

Kind regards 

Beth