If you are a total beginner to canoeing, don't worry, you will learn the basics quickly. It's similar to cycling but different. Once you get the right technique, you will never forget it.
As a starting point here are some youtube video (thisthis and this), but you can find tons of other videos and descriptions on the net if you google around.
Swimming ability
If you are not a good swimmer you have to wear lifejacket.
Lifejackets will be available for everybody, it is going to be your decision whether to wear it or not.
Traffic regulations
Here is an excerpt of the traffic regulations for boats, especially canoes. Please read carefully.
Waiver of liability
In order to prevent any controversy further on, you will have to sign this form before participating the IREX.
In short by signing this, you accept that you are responsible for all your acts and decision.