First, I would figure out a budget.
You want reliability, so ask about certain makes, such as Kowa. Mamiya made a 645 SLR system that should be available at a decent price, but you'll want to check to see if the camera will need to be serviced.
A TLR is a nice introduction to medium format, although prices for Rolleiflexes and Rollecords are high at the moment.
A folding camera is the budget way to go. Some like the cameras with triplets and lower-cost lenses, and they seem to be a good option, although you should shoot these at f/8 and smaller for the best results.
Prices for folding camera can run from $10 to $500 or more. The Zeiss Ikon Ikonta 6x6 camera with a Novar or Tessar is a nice place to start. The Novar is the budget lens, and the Tessar is the premium lens. These will run you about C$15 to C$150.
It's not unusual for one or all of these cameras to need service. After all, these will be anywhere from 50 to 80 years old or more, and anything mechanical should be serviced.