How much NOTICE do i have to give my landlord???

I have been renting this house since July of last year and i wanted to leave because i can no longer afford it anymore. I have a new apartment for May 1st. How much notice do i need to give my landlord? I never signed a lease, just the application for the landlord to rent. But, I did give the landlord a year's... show more I have been renting this house since July of last year and i wanted to leave because i can no longer afford it anymore. I have a new apartment for May 1st. How much notice do i need to give my landlord? I never signed a lease, just the application for the landlord to rent. But, I did give the landlord a year's worth of post dated checks until this july. Does the notice need to be written or can i just call him? Please any advice? I really need to know & i live in Ontario, Canada.thnks
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