Alex mate, i met my wife in London too, she is polish, to get a polish citizenship u must live in Poland for 2 years and be married at least for 3 years. Asi de simple.
If your wife gets a contract to work in England, Spain etc, u have the right to stay with her in the same country and to work too.
You can get married in England if u r living in your own place and can submit an adress confirmation or, 4 example, a phone bill that shows your last name.
You must apply for a polish visa ( if asked) in Mexico. Us South americans dont need visas if our stay is short, except for Peruvins and Colombians, who always need visas. Once in the polish consulate in Mexico they will ask u for your bank accounts, for papers from your current job and probably for an invitation from someone reliable inside Poland.
Eso es todo, simple. Once in Poland u can apply for an extension of your visa for up to a year, la misma que debes de renovar luego.
Alguna otra pregunta bro?

Good luck.