Hi and welcome to the forum. Things are being tightened up in this country with regard to student visas because there were so many people coming here who were not registered with genuine colleges and who's real intentions were to get to the UK to work. So if and when your wife decides where and what she wants to study in the UK, you should ensure that the college is genuine and is on the UK government's list of recognised colleges. She will also have to have finances in place to support her in the UK for the period of her study and she can't rely on working here to support herself because as a student she will only be allowed to work 20 hours a week.
As for yourself, I think you will need to read this http://www.ukvisas.gov.uk/en/howtoap...sskilledworker , because I don't think you will be able to join your wife here if she only has student visa, I think you will have to qualify to come here in your own right under the highly skilled migrant points based system.
Iain.