Amanda,

I'm currently living/working in London so feel free to ask me any questions.

For accomodation, you can rent your own room in house or an apartment etc. Most places come furnished. Check out the site www dot gumtree dot com (sorry unable to place links here).

As for work, you haven't mentioned what field you are in so I can't really help you here. A good site for jobs is www dot jobserve dot come.

Being 24 you will be able to apply for the working holiday visa. They keep changing the rules so check if you are able to work the full 2 years or not. To apply for the tier one, you will need to have a masters.

Regards,
Nessie