At this point you have done the minimum amount of modifications to get
the motor ready for flight.  While it is possible to modify the flywheel to remove
the cooling fins and other material, I do not recommend the average person try
this as the flywheel material is quite brittle and will explode apart with the
engine running if done wrong.  My advice is to get a professional to do this for
you.
       Using a conversion kit, such as the one provided by Wacker engines, start
to assemble the motor.  Follow any instructions that may come with your
conversion kit during this.  One thing that is commonly not covered is that when
installing the engine mount to the plastic carb plate, a small washer is needed
between the engine mount and the plastic carb plate at one of the screws.  
Look carefully and you will see which one.
       Once you are all done your motor should look something like this and this.
Be aware that these motors sip fuel so you do not need as big of a tank as glow
engines or the high end gas motors.  I can get a 30 minute flight on my Sport and
only use about 12 ounces of fuel.   Your mileage may vary.
   Now go buy one of my kits and fly!!!!