Moving to montreal from the uk (Montréal)

Hi Everyone,

I'm planning on moving to Montreal early next year and was wondering if anyone had any advise/recommendations as to a good company that handles visa/permits for U.K. Residents looking to move to Montreal, I'm moving to be with my girlfriend that is a Montreal local so I will have a sponsor etc but just don't know where to start with the process,

Any help would be very muchly appropriated

Thanks
Tony