Piano for an "Oldy"

I play from sheet music a long time. In the country I was born (Hungary), we were only suppose to play from music books and nothing else. So it is time for me to learn somthing new. I would need help to harmonize the songs and classical pieces I want to play. Otherwise I am a tax accountant in Canada, Ottawa and after the tax season I seriously getting into playing.I hope you will be able to help me.