Depends where your to study, part time jobs are avaiable but their are rules on the amount fo hours that you can work as a person with a student visa (Im sure students have mentioned it to me) its unlikely anyone will check up on you but best to be aware. Also many part time jobs in the UK are Zero hour contract, so the employers can dicate what hours you work each week/month. Ie a shop before christmas or a big sale may give you loads of hours and then none in quiet periods. That or offer you hours when your studying or need to sleep for your studies.
Some colleges may have some form of list of part time jobs but due to the workforce avaiable to the employers since about 2004 when most of the eastern european countries citzens were allowed to work in the UK with no VISA they are more likely to use people who are avaiable 24/7 and not students so source them via other methods now.
Its not impossible to come over to the UK but you to need to show you have the funds to support your self. Accomdation will vary in price but in London and the south east a room may cost anywhere from 50-100 pounds a week, food for a person may cost 30 pounds, a travel card (a way of using the bus and trains in London for a fixed price) may cost from 15 to 41 pounds a week depending on where you live.
I don't know what the goverment require to see in the way of proof of funds but i would think you need to show you can support your self for most of the school year, so say thats 9 months that maybe 600 to 800 pounds a month maybe more which would be 6 to 8 thousand pounds. Plus tution fees which may cost thousands as well.
Good luck but make sure you research well and be wary of agencies.
