...you increase your mileage and stick to it! You have about eight months to go and with the amount of miles you are putting in you have "something" to build on, which is good.
Work on now increasing you weekly mileage up to around 25 a week to where it is comfortable. Enter some 10K's and a half between now and December. Be sure to give yourself a day or two of scheduled rest during the week. Maybe on one of those rest days make it a cross training day on a stationary bike or in a pool if you have access to one. One day for sure though is REST!!
By January you should be able to handle a marathon plan for a first timer. The key is to maintain the integrity of your workouts. Take it easy and run, at whatever pace you can handle, all your scheduled runs. Physically it will make you strong and mentally it will give you confidence.
Rather than spending money on a book, use the web as there are pleanty of sites that you can get the same info for free. Instead, use that money on two good pairs of shoes. With eight months to go until April you will probably be looking to possibly replace them at the year's end as in eight months of running you should put in a few miles that by marathon time they'll be worn out. Good shoes cost good money but injury is a lot worse!
Run your race, have a great time and be sure to buy the marathon photos of yourself out there if they are available.
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