How do I create a channel cast and summon an object in a selected area

My goal is to make it so when i press the button 1, a pre selected summoning circle will appear at a set distance in front of the FirstPersonController on the terrain/plane, i then need to cast a channeling spell and have an object summoned(spawned) from the point on the plane/terrain after it channels a cast. im looking for something similar to moves like summon:felguard or revive pet from W.o.W. P.S. it would be prefered if the scripts used could be in c#, although javascript works too.