I have a P C with Windows XP - I am thinking of changing to an Apple Mac. can I use Yahoo etc. on the Mac?

I want mainly to surf, use Microsoft publisher, write letters, do office work (accounts etc.) scan docs, edit videos and digital photos as well as email friends. Will I need a complete change of progs to do this - I am thinking of a used Mac some three years old . . . . any advice would be apreciated.
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