Select the right camera

Hi All,
I would like to become a professional photographer. On September I
will follow some classes and I am reading a good manual at the moment.
Could you suggest me a good camera to start with with the budget of
$350-$500. Is better a new one with limited features, or a second hand
but older and full feautured? Is better a F100 in good condition
second hand, or a Canon EOS300v brand new? What are the disadvantages
of the F100 because is a quite old model?

Thanks,
Tony

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