Visa requirements

Good Afternoon .

I have been researching for sometime to try and find the answers i require regarding my wife travelling to and living in spain with me .

We currently live in the uk with our young children  my wife and 1 son 11 years old are here on a spouse and dependant visa with indefinite leave.

My adopted son is applying for british citizen ship   therefore my inquiry is for my wife .As she cannot apply for citizenship in the uk until 5years we have another 2 years to wait on that process should we decide on uk citizenship .

I have a potential job opportunity in spain and i also have the opportunity of buying a current operating business .I would like information on firstly is it possible for my wife to join me in spain  and also settle in spain ? can you advise or point me in the correct direction as to where i can get the correct information  as i need to know before i commit to anything  also i want everything to be correct as we have 2 young boys aged 4 and 11 they will also be schooling in spain  .

i appreciate any information you can assist me with 

Thank you