How do I train to run a 5k?

I can't run terribly well. Just short little sporadic jogs throughout the walks I take. So assume I'm at the bottom level of fitness. How much should I aim to run or walk when I go out? For how long? How many times a week? How quickly and how much should I increase the running?

I've looked on the internet and every single site says a different thing. What did/do you do?

I'm doing this for the hell of it. Weight loss or health or whatever else isn't a deciding factor for anything.
How do I train to run a 5k?
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