Hello and welcome!
As to the student visa as far as I know you can only work up to 20 hours a week + maybe a few extra if it's to do with the course that you are studying. I think to be able to get the visa you need to show savings in your account so you can support yourself ok once here (most part-time jobs here don't pay so well) and also be able to show that you have been accepted for a course by the uni or college etc. There is more info on the requirements on the British home office website here: http://www.bia.homeoffice.gov.uk/studyingintheuk/
