I'm not an expert but I ran cross country in high school. Went to college got stupid, ran sporadically. Picked up after college. etc.
I'd suggest buying a Garmin watch. The same maker of car GPS's. Usually they run $120-$500 depending on what you want to calculate. You have ones that calculate biking and swimming as well as running. You can track your progress with the training center online. This way you know exactly how much running you are doing. How many calories. Heart-rate, etc. All this is important.
If you don't buy this watch and use "map my run" or something along those lines you run the risk of not knowing the exact miles you are putting in. Would a body builder play around and not know exactly the amount of weight he is pushing at any given time? Probably not. BUY THE FREAKING WATCH!
USE THIS CALCULATOR.
Training Paces | Runner's World & Running Times
TYPE IN YOUR LAST RUN AND THE TIME. THIS WILL TELL YOU HOW FAST AND HOW SLOW YOU NEED TO BE RUNNING FOR TRAINING. USE IT!!
I run my training in cycles. 4 months of building to a peak race, then 2 weeks maintenance, where I cut my mileage in half or by 40%, so if I'm at 70 miles a week including the "race" then that next week I'm at 40, then the following week 30. A lot of stretching and relaxing. Ice baths, deep tissue massages etc.
I have a race in a month. Right now for the week I'm at 32 miles.(hadn't done my 4 mile easy run schedule for this afternoon) The week started on Sunday. I alternate between rests. Either I take one day off a week or once every ten days.
Sunday - 6 miles easy/44minutes. Usually have headphones in and enjoy the day.
3 miles easy/ 24 minutes.(pm)
Monday - 3 miles(morning) easy/25 minutes.
8 mile tempo/ 45:19..Felt really good.(pm) Before any tempo you need to do at least a mile warmup, before kicking it into high gear..Tempo runs are your bread and butter. They are at 75% -80% of your max effort.
Tuesday - 6 easy miles easy/47 minutes. Took it really slow after a strong effort.
Wednesday - 2 mile warmup - 16 minutes. Then I rolled into 1x4 repeats(1 mile repeats)
4 miles easy tonite scheduled.
Thursday - tomorrow will be my scheduled day off(10 days straight)
Friday - 5 miles scheduled easy
Saturday - 12 miles or 90 minute run(which ever comes first easy)
That will put me at 53 miles for the week.
I'll add more info into it later. Gotta get back to work.