i beleive ,bank statements for the past 6 months, wage slips ie proof of earnings over past 6 months, though i have heard of less than six being accepted,if you dont work but have a good amount of savings this may be enough,the main thing is that you can prove that you can keep her financialy for the first 6 months without her being dependant on the state,and of course a place to live ie your own home, council house, or with relatives provided you have your own room big enough, if im wrong about any of this info i just gave you, im sure those here that are more knowledgable than myself will correct me,
some or all of your answers your looking for im sure you will find already answered in other posts, good idea to look around