Upgrading RAM for older iMac

Hello, sorry if this has been asked a million times over. I am going to upgrade my iMac to OS X Tiger from 10.2.8 and thought I would upgrade the memory at the same time. I have never bought memory for a computer before so I have a few questions.
1. Where can I buy it, just anywhere online, it will just work (as long as it for the right computer)?
2. Do I have to fit two memory pieces of the same value, I currently have 256MB, but was thinking of going to 1GB, so would this be two at 512MB?
3. Finally how do I actually do it!
Many thanks.

Kappy,
I'm sorry to do it this way, but I wanted to contact you - as I remember you'd been very helpful with my prior questions - and I didn't see any other way to do so. I know it has nothing to do with this thread...I'm just hopeful that you're still monitoring the topic.
When you get a chance, would you be so kind as to read the below post for me? I'd be extremely grateful!
http://discussions.apple.com/thread.jspa?threadID=1182717

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Upgrading RAM for older iMac

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