running - beginner speedwork for 5k/10k?
Some background: I started running about 9 months ago, and hated it (and was terrible at it) at first. I ran my first 5k in September, and another in December (31:56). But I think I've finally turned the corner from "tolerate running" to "kinda like running"! For most of that time, I ran twice a week, but I've recently upped that to 3-4 times as I've caught the bug.
I'm currently running 3 miles 2-3 times a week, and 4-5 miles once a week, all at an easy pace (11:30ish for me right now). I'm slowly increasing my distance each week (adding about 1 mile per week, split over a couple days).
My goals for the spring are to get my 5k time down to <30 minutes, and to run a 10k (hopefully <60).
My question is, when I'm at a distance/weekly mileage that I'm happy with, I'll probably add in some speedwork once a week, but what kind should I add? Short intervals? Long intervals? Tempo? Strides (isn't that just another word for short intervals?)? There are so many plans and bits of advice floating around that I can't figure out where to start.