Pictures on my nikon coolpix are grainy?

Whenever i take pictures with my new nikon coolpix S550 [10 mp] camera, its pictures are either grainy, blurry [no, not due to hand motion] or part of the picture is lighter than the other.

i've read about ISO, and right now it's on auto.
i've tried putting it on manual 100 too, but idk, i guess i'm still not satisfied.

i feel like the picture quality isn't better than my old powershot =/
any ideas, comments, fixes, help!
thank youu =]

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Microphone for Coolpix p510?

I have a nikon Coolpix p510 and i want to get a microphone that is a reasonable price and works well on this exact camera. If you could give me links to the exact product and why you believe it to be good.perhaps from personal experience with it or what not that would be lovely.thanks!

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Can you pause while recording on the: nikon coolpix p500?

I just wanted to know because i want a camera really bad, decent price camera. And this camera may be on the list.

I hope it does cause some of the cameras on the list of what camera i want, you can pause while recording!

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