The OP would have to wait 3 months before any benefits and some are two years.
Child Benefit. A 3 month wait for a British citizen moving to/back to the UK, but as the UK and Canada have an agreement, I wonder if, as a Canadian, there is a 3 months wait for Child Benefit?
https://www.gov.uk/child-benefit-move-to-uk
Tax Credit. That link on the welfare benefit Tax Credit, is out of date: that short lived welfare benefit ended. They are two of the low income, means tested welfare benefits, that have been replaced by Universal Credit. UC also has a 3 month wait and then pays 5 weeks in arrears. New claimants claim Universal Credit (if they can) and those already on the low income welfare benefits UC replaces, will have their benefits end in due course and then they can claim Universal Credit (if they can).
If you have savings, capital, a house you don't live in or land, in any country, and that is £16,000 or over, then there is no Universal Credit as there is a 16k cap. If the OP reduces her saviings to below 16k, without falling foul to the deprivation rule (disposing to claim means tested benefits) then she might have a claim. If looking for a house to buy, the DWP (who handle UC claims)
might disregard her house sale money for a few months.
This might not apply to the OP as she might be planning on working full time.
However, UC is compeltly different rules to some of the benefits UC replaces and especially for the Tax Credit benefit. Unlike the short lived Tax Credit welfare benefit, where both parents didn't have to work, or only had to work 24 hours a week between them to get addionatal money given to them through the Working Tax Credit part, on Universal Credit both parents have to work, with at least one parent working full time.
https://www.gov.uk/universal-credit/you ... sibilities
A single parent with a child of over 12 years old claiming Universal Credit, is expected to work full-time: 35 hours a week at the minimum hourly wage is 35 x £8.91 = £311.85 (£16,216.20 a year). But as UC is a monthly claim, the monthly minimum amount earned would be £1,351.35 per month for a single parent.
Parent/s with a child claiming UC, have a UC work allowance, which is money the claimant can earn each month before there are deductions from the monthly Universal Credit amount at 63p in the £.