In my opinion, you should read the Kilo-Five Trilogy, catch up on the gaps between Halo 3 and Halo 4, then if you want, the Forerunner Saga. You then should read the Fall of Reach, The Flood, First Strike, Ghosts of Onyx, Contact Harvest, and the Cole Protocol. They are all really good books (12 I just put in). That's if you have enough time this year to read them.
Then the games. Play them in Chronological order. That makes sense...again in my opinion.
-Halo Wars
-Halo Reach
-Halo CE/ Anniversary
-Halo 2
-Halo 3 ODST
-Halo 3
-Halo Spartan Assault (If you have it)
-Halo 4
Just saying, this is how I would do it.