I think an easy way to make your time line would be to cut an 8-1/2" x 11" piece of paper into strips and write down each major event in the story on a separate strip of paper. Then, using the book as a guide, put the strips in the order you want, either chronological order in Katniss's life or how they're listed in order in the book (whichever method you're talking about).
The neat thing about the strips is that you can move them up or down the list, depending upon when they happened. If you come across two events that happened simultaneously, decide which one would come first in importance. When you think you have all events in the correct order, tape them into place and make your official time line. Good luck!
The events of the novel can be confusing given the flashbacks where Katniss describes events which happened prior to the opening of the novel. Whenever I am creating a time line, I always start at the end (meaning the reading has already been completed). By doing this, one can define the time line based upon its backward movement (given some things are explained after they have already happened).
I would also consider including the key events that frame her relationship with Peeta, like when he gives her the bread. Which events would Katniss consider the most important to her? I would choose events that have significance in relation to Collins' development of Katniss' character. You should definitely include her alliance with Rue and the decoration of her body with the flowers.
I think if you are doing a timeline, I like the events that pohnpei397 came up with to start. After reaping day, I would include the opening ceremonies, training days, and the interview session. I would definitely include her relationship with Cinna in one of those events as that it is an importnat event in her life. Katniss has very few people she connects with and trusts.
Once the games begin, you could track obstacles for Katniss: search for water, fire, Tracker Jackers.
I hope this gets you going a little more. Think about which events mean something to Katniss and the outcomes of the game -- both physical outcomes and outcomes regarding Katniss's maturation and growth.
First, I think you need to determine whether we are talking about chronological order or order that it happens in the book. If we're talking chronologically, you should start with the rebellion and then move on to the death of Katniss's dad. Maybe then you could have her starting to hunt and meeting Gale. Then you could have the events of the reaping day. How's that for a start?