General contribution limits for RRSPs and TFSAs are set by the government and can be found here. You can view your individual contribution limits by logging into your CRA My Account or by looking at your latest notice of assessment under “Available contribution room for [YEAR].”
It is your responsibility as a member to ensure you do not exceed your limits under the Income Tax Act. You would be solely responsible for any taxes or fines imposed if contributions exceed the RRSP or TFSA limits.
You can set up a monthly savings plan, and make other contributions throughout the year as you would like. Monthly savings plans are pro-rated and capped at the annual contribution limits, but if you have more contribution room, you can make additional contributions as you wish.