As an estate trustee (also called an executor), your job is to administer the estate of the deceased. Broadly speaking, this involves wrapping up the deceased’s affairs, tallying all assets and debts, settling any financial obligations of the estate, and distributing the assets to the beneficiaries according to the will. If the deceased died intestate, i.e. without a will, then the assets of the estate will be distributed according to Ontario's Succession Law Reform Act., R.S.O. 1990, c. S.26.
It is best to retain a solicitor experienced with wills and estates, especially when the estate is large and complex.
For additional information, visit the Government of Ontario’s Frequently Asked Questions about Estates.