Not a good idea to move to Spain just like that and specially with 3 boys… I don’t know what ages they are but have you thought of:
- Language barrier…
- What area would you prefer to come to in Spain?
- How much is a home to rent or buy?
- What schools are your kids going to go to? Spanish, English school?
Find some information first about the different areas in Spain, You will find more English speaking people on the costas than inland, I don’t know what your financial issues are like but come on holiday first and have a look around and sort out essential issues first, make some friends and ask for their experience, there are many budget airlines, and you can probably rent something for a reasonable price and see if you will get offered a job.
But this is only my opinion and experience, I live here for 22 years, I have seen many families come and go, I was lucky to be introduced in to a Spanish school when I was a toddler, and I am very grateful for it, your business opportunities multiply if you know Spanish.