Can anyone give me some dating tips (for London)?

I'm a 17-year-old Turkish girl and I'm going to stay in London for a month (i'll attend a language course and stay with a family). I wonder how flirting and dating things goes there. For example will he expect sex from me in a time shorter than a month? Or do boys pay for drinks or cinema tickets on a date?(In Turkey they do.) Any tips would be welcome!!:)