hi sumaira
certified photocopies in general r like this: find an official translator, u show him the original documents, he will make a photocopy of the original and attach to that photocopy his English/French translation....both the photocopy and the translation will have his official notary stamp....now this process also depends from region to region - see the region specific guides how it explains there to do it....some people say that the best way to do it would b at Canadian consulate - which u can enter since u r Canadian citizen....it will b very costly but at least u r sure the translator is recognized by Canada
yes it would have been better to have an employment letter....i think the employer didn't understand that u r Canadian....by the way did u ever live in Canada - do u have social insurance number (if no then he cannot hire u), did u ever fill Canadian taxes? do u have any bank account, credit card there? did u ever visit Canada? do u visit regularly? if it's NO to all these than it would b difficult to prove ur return since u never lived or went there....i guess describing ur situation in the current country (not safe and why it's not safe based on ur situation with proofs if possible) and other personal things related to ur case would help; explain that the only thing which keeps u there is ur daughter and u tried to go to Ca before but her visa was not granted, hence u could not leave her; affidavit (certified letter = signed in front of a notary with the notary stamp) from ur brother stating that u and ur daughter can live with him once u arrive and he will help u financially until u can manage on ur own will be very important; also if u have any savings u can show proof of that
good luck!!