I am a spanish citenzen and my fiancé is from USA, I'm living and working in the UK, and I'm getting married on October, I would like to know if my fiancé (my wife on Oct) can come to live with me in the UK when we will be married, and what I need to do for the request.
Thank you, Ivan

She will be eligible for dependent visa.
You can start here: UK Border Agency | Home Page (http://www.ukba.homeoffice.gov.uk/)