I am not trying to discourage you from participating in this great event, but if you are new to running this is a very big feat to accomplish in a very short time.
I, along with many running coaches, recommend a solid 6 months to a year of running to be able to complete a race of this distance. Running is not just running. It's about building the tendons, ligaments, bones and muscles to run a distance of this duration in addition to developing the energy systems to take on the 13.1 distance.
If you are a new runner, my suggestion is to find a good half-marathon walking program. Trust me, many people walk half-marathons.. The risk for developing an injury is much greater for those who do not have a solid running foundation when they begin their training.
You can do this, but you may need to re-think your goal.