Okay, I am in a similar boat and asked the same type of question. I ran my first 5k last year. I only ran for 6 weeks before the race and my time was 22 minutes (I'm a girl, so not bad). I am doing another race in 7 weeks and I want to actually train this time. Based off the advice I got, I am doing the advanced Hal Higdon, 8 week, training schedule. I am using the McMillan Running Calculator to find out how fast I should be going on each day. It's a great tool! I hope this is somewhat helpful. I'm no expert; but, I have been doing some research.