Need suggestion on camera for publishing magazine articles

I'm a newbie writer who would love to have some magazine articles
published. I was speaking with a publisher at a recent Writer's
Workshop and he asked me to, along with my article, submit photos of a
minimum 300 dpi at the published size (bigger the file, the better).

I do have several cameras but they are all older and of minimal
quality. My digital camera is just over 3 megapixels and I'm guessing
that it is entirely inadequate.

I'd love to get a new, higher resolution digital camera for this
purpose but have no clue as to what I should get or even if a digital
camera is the way to go. I also have not yet figured out how dpi and
megapixels relate to each other.

I'd appreciate your thoughts and suggestions including specific
cameras to consider.

Thanks for your help.

Sandy
.

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