I'm planning to go to England to work during my summer break. Though, I do not know much about England's geography/economy. I'm 18, this is the first time I'm doing such a thing. I have many inquiries:

What are some of the cheaper places in terms of living expenses? How much would they approximate cost

Would it be easier/better if I find a job offer before traveling and apply for a work visa instead of a tourist one. If yes, where can I search/apply for job offers such as cashier, waiter, barista, etc..

What are sites/apps I can use to find a cheap place to stay; I need someplace extremely cheap for my first 4~5 days until I can find a job (if I don't find one online).

Thank you in advance for any reality checks, suggestions, tips, etc.