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What province is this place?
How long have you been married for? Did you live together first and if so for how long?
Are you incomes about equal?
Is your income higher than hers?
Is your financial undertaking for three years?
Your obligation is to provide her with spousal support for at least the time of the undertaking. In most cases the court would order the support to be paid for somewhere between 2 to 4 years after you separate.
It will make sense for you to consult with a family lawyer face-to-face as your next step so that you can determine how much support you should offer her and so that you can try to settle this matter without going to court.
Given your facts an experienced family lawyer can likely settle this quite easily and you should not have to go to court to deal with this one issue.