I mean, investing in fixed - income bonds etc could mean an extra source of income which is required while settling initially

And what the procedure for taxes on these incomes.

Or is there any other way I can use some amount to maximise profits and/or income, like some kind of govt securities and so on

thks

Generally, there is no restriction from investing in Canadian fixed income bonds prior to your immigration to Canada. Before a person becomes resident in Canada, interest and dividends paid by Canadian entities are subject to 25% Canadian withholding tax with no further requirement to pay Canadian income taxes. The withholding tax rate may be reduced by an income tax treaty between Canada and the jurisdiction in which you currently reside.

Once you become resident of Canada, you will be subject to Canadian income tax on your world income earned after that time, including any interest or dividends earned on Canadian securities.

Disclaimer
The nature of this facility is to provide a general response to a general question. Under no circumstances should anyone act on this information without obtaining analysis and counsel from a qualified advisor with respect to the specific situation.
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Phillip Nadler, CA
Richter Usher & Vineberg
http://www.richter.ca