1. Where to find information on what advantages or disadvantages does Joomla have over other packages (for example Typo3).
It would be better to ask this question in another Joomla! forum as this thread is specifically for answering Joomla User Group registration questions.
2. How to find a local Joomla people or groups? I tried looking around this forum but could not find anyone specifically from Canada or Calgary in particular.
Joomla! User Groups (JUG) List
Currently there is not a JUG in Calgary. There is one for Toronto. It just takes a few from Calgary to start a JUG Calgary. Hopefully, some Joomla! Calgarians will come out of the woodwork and start one. I live in Quebec City, but have lived in Calgary for 16 years, and my kids were born in Calgary, so we are very attached to Calgary. Great city!!! Looking forward to getting to know you.
3. Is it possible to find on this forum Joomla developers to discuss some possible projects?
It would be better to ask this question in this Joomla! forum.