CONCLUSION
If you are a new teacher I would definitely recommend starting in an English language academy. This will allow you to gain experience and see whether or not you really want to stay and become an English teacher in Spain.
A native English teacher is NEVER out of work here. After Brexit, there has benn a shortage of native English teachers so salaries at least in theory are rising.
After your first year, you will know which are the best academies in town or if you are confident enough to go it alone or even start your own academy. Good Luck!!!
If you have any questions about being an Englih teacher in Spain, then please leave a comment at the bottom of this page or get involved on the teaching english in spain section on the forum.
Anthony