In addition to proper soil preparation you need to have patience. Your lab-grown seedlings will be tiny and you may not see any flowers for 3-5 years. You are fortunate to live in Minnesota where the climate suits this type of plant.
Got my first (and only) C. Reginae plant at our local swap from a woman who grows them here in Savannah, Georgia.
Here is a place in Massachusetts that grows the plants in the lab; you can get info about varieties which may be easier for you to grow.
http://www.hillsidenursery.biz...
http://www.hillsidenursery.biz...