In regards to rent it all depends on where you're staying in Montreal. I suggest taking a look at PadMapper(http://www.padmapper.com/) to help you find a place to live.

For internet I'm using TekSavvy (http://teksavvy.com/en) they seem to have the most affordable plans when it comes to what you're paying for and what you're getting.

Startup lawyer wise check out this thread on Quora (http://www.quora.com/Montréal/Who-are-the-best-startup-lawye...)

Lastly, if you're looking to get involved in the startup community we ALWAYS have a ton of stuff going on. You can find more on these sites:

Next Montreal (http://nextmontreal.com/)

Montreal Tech Watch (http://montrealtechwatch.com/)

Notman House Calendar (http://notman.org/en/events/)

Montreal Statup Digest (http://startupdigest.com/)

Cheers!