While I have seen a few online and not had the time to ask the experts, I will start with this 16 week plan. The other plan I looked at was this, by Hal Higdon. The former was a more easier one to use. The only flaw I see with the 1st routine is there are no additional training recommendations like strength (runner’s swear by it) and other cross training exercises. I will tweak this plan as I go and create something which is far more practical while continuing to provide the ease of use.