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First-time filers have to do a paper return and then use NETFILE moving forward.
Given that you have filed 25 years ago, please contact CRA for further information. You can contact them at CRA Tax Enquiries: 1-800-959-8281.
Helpful tips for first-time filers can be found at Tips-TurboTax.
Additional Information can be found on the CRA website regarding income tax rules that apply to Non-residents in Canada at CRA-Non-Residents, and there is a detailed publication at CRA-Income Tax and Benefit Guide 5013-G which gives you all the necessary information that you need to file your income tax return.
