#1, I ran a half marathon last Saturday the 15th and I finished in 1:22. I run for my high school, so I am regularly going through semi rigorous training. If I were you, I would start to increase my mileage weekly (or even bi-weekly) by about 10%. I will also go off of what #5 said and also try to run for a certain amount of time. I would plan on running for the amount of time, not the amount of distance you plan to run for once or twice a week and keep track of how long you are running. For proper training, I would also try to run a half marathon distance at least once before your race. Not at race pace, but just a little slower than your training pace. Lastly, you should try to add one day of running to your normal running schedule. So if you are running 4 days a week now, run 5 days a week for the next two weeks, and then run 6 days a week. Don't run all 7 days of the week, because then your body won't have time to recover. I hope this helps. Good luck!