The Day the first term ended that year Harry and the DA had a last meeting before the Christmas holidays. After that meeting Cho and Harry where left alone and they kissed for the first time. That night Harry had the vision of Nagini attacking Mr.Weasley. That was Harry's first kiss.
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In the book he kisses Ginny in her room before being walked in on by Ron and Hermione. In the film he kisses Ginny in the Burrow kitchen before noticing that Fred is watching them :)
Harry kisses Cho Chang and Ginny Weasly.
She is from Japan.
We don't know for sure but it is likely to have been Cedric Diggory.
Nobody killed Cho Chang, she survived the series. Cho later married an unnamed muggle man.