Pardon eligibility varies. In general once your sentencing & fines are paid, a 5 or 10 year waiting period is required for convictions before being eligible to apply to get a pardon in Canada.

Yes. A pardon is required because the DUI conviction is a criminal offense.

After fines and sentencing have been complete, a 5 year waiting period is require for a DUI summary offence.

While eligibility for entry to the U.S. depends on the nature of the crime, a U.S. Waiver can be applied for to allow travel to the U.S. with a criminal record.