Consistency is the thread that connects your workouts, long runs and races. It's what holds your training together and helps you progress as a runner. Without consistency you'll stay at the same level of performance. I've seen runners casually take two weeks off from all exercise—and then wonder why they can never get in shape. Or a runner will feel minor discomfort and immediately take a month off from running.
These types of setbacks can destroy consistency.
Instead, commit to a schedule of at least three days of running per week (it's hard to improve with less running if that's your goal). Stick to that level and after a month, increase to four days per week. If you're consistent with you training regimen, you'll be able to stay healthy and improve your fitness.
Skipping strength training is a common mistake for new runners.
Body-weight strength exercises, gym workouts and core routines are the best tools you have to prevent chronic injuries. Set aside 15 minutes after your run for strength training.
Remember, a strength session doesn't have to be complicated. You don't need a gym or any special equipment, all of these exercises can be done in your living room.
Stick to basic exercises that are important for runners.race.