Can I work with dependents visa in Spain?

I am an ESL teacher from Iran with +6 years experience working with young learners aged 3 to 12. I will be in Spain in 6 months with a dependent visa. My husband is a student in URV.
I have 3 questions now, and would appreciate if anyone can help:

1. Can I find a job and work in Tarragona or Barcelona  as an ESL teacher with dependent visa?

2. What are the requirements? Do I need a certificate (TEFL or TESOL maybe)?

3. Do I need to take an IELTS exam? If yes, what score would be acceptable?

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