Hello,
I'm currently a student at Lancaster and hopefully I can help.
Living in the city can be cheaper but bus passes and longer letting contracts means usually it's not (although for a postgrad you might get a longer contract on campus). On campus you'll be close to everything you need to (the grad accommodation is very near management school), although you may want to do your shopping off campus as it'll be cheaper. However it can be a bit of a bubble and obviously mostly first year students live there. If you live off campus then you'll have easier access to the train station, all the shops in town and all the pubs/bars/restaurants as well. The commute is about 15 minutes from the city to campus (depending on the time of day).
In terms of part time work, there's opportunities on the careers website that someone's already posted, and jobs such as ambassadors on open days etc will go up later in the year. Otherwise, you can probably find retail/bar work in town if you start applying now before the freshers come in.
Let me know if you have any questions,
Charlotte
2nd year Biological Sciences with Biomedicine