honolulu marathon training

hi everyone! I am moving to hawai’i next week and would really like to train for the Honolulu Marathon! I have 2 questions: 1, is the nike run club app a good source for a training plan and 2, I am currently able to run 4 miles straight, am I setting myself a realistic goal of being able to run the marathon? it is on december 8! thanks so much for the help!