Charlieromeo123,
I think it's safe to assume that the very first part of the basic terms & conditions of the contract says you should set up a company in Ireland, no?
So it will be your service company that pays the income tax and social security. The social security is paid in the country where you are based, i.e. Spain. Only people still paying social security in Ireland are those who have done it prior June 2012 and live on grandfather rights.
Your 'Ryanair approved' accountant should sort out the social security payments.
Your income tax will probably fall under the double tax agreement between Ireland and Spain. Both countries may see you a resident for tax purposes. You may have some luck reclaiming taxes from Ireland, but don't hold your breath. It's a dispute that never ends.
On the direct FO Ryanair contract where will the company contribute the social security and income tax?
Is this question relating to your situation? Just to be sure, if on Storm the connection to Ryanair is: Charlieromeo123 --> Service Company --> Storm McGinley --> Ryanair. About as in-direct it can possibly be. Your Service Company will invoice Storm, receive money, pay taxes/social security and your salary. Storm will locate work for your Service Company, and you are its representative.
As for the income; I would say that 40-45 % of what your service company invoices will go to various taxes. Multiply the expected yearly hours (700-900), your renumeration rate psbh and 0,55 to 0,60.