Glad the first start went well! Couple thoughts on the items you noted:
Are you running the external Rotax alternator? If so, be sure you have a 12 volt power source connected to the back of the alternator or it won't put out any juice.
If the coolant leak is coming from the water pump housing and you removed the pump at any time, be sure you have the "seal washer" on the correct housing bolt (bottom most as I recall) or it will leak. You have to look closely to distinguish it from the other "standard" washers associated with the bolts holding the pump housing on (yes...I speak from experiance on both of these issues).