I would say c25k is the best plan for you reason being you work your way along the plan and endurance comes with each week then once you have completed it you can then work on your speed the thing is , is to take your time and follow the plan ie. Don't skip rest days warm ups and warm downs etc it works really well as I was never a runner and this plan is great . Hope this helps
C25K is the perfect way to build the stamina and endurance base from which you can work further on speed.
It is inadvisable to work on speed and increase distance in the same run.
Perhaps this guide to post C25K running healthunlocked.com/couchto5... will be useful, as it is difficult to assess precisely where you are in developing your running.
As I said,C25K would be a good starting point, as the only safe way to develop your running is with slow and steady progress, so following a plan is always recommended.
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