Well it depends on which one you are talking about.
The first book she is the one picked therefore making Katniss step in for her, which sets the rest in motion.
The second book... Well she does nothing really.
The third (SPOILER ALERT) she dies, making Katniss go crazy and hate Coin and perhaps lead her to killing Coin.
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Katniss is telling the story in first person
Paula Malcomson.
There are twelve districts. Katniss Everdeen belongs to District twelve. Every year there is The Hunger Games. One boy and one girl from each district compete until the finish. Katniss Everdeen and Peeta Mellark get picked from the reaping. They fall in love and win The HUnger Games.
Primrose Everdeen was killed in a bombing, but it never said who specifically was responsible.
Cinna was Katniss's stylist in the book and the movie.