If your club has never organised an event before then try to find an organiser from another nearby club who would be happy to talk you through the process. There is a lot of basic and specific information in the CTT handbook and on the website, so have a look around.
Get in touch with your local District Secretary, or open events secretary and they too will be happy to help and put you in the right direction. They will advise on the courses and dates that are likely to be available for you to use, or if you have a new proposed course, what needs doing before it can be used.
Make sure your club is happy for you to actually put on an event on their behalf - you will need their backing!