Sako

I have currently rebuild my rx8 and used aktins rebuild stuffs, everything is new in engine and i have resurfaced the rotors, now when everything was done and engine is back on rx8 it won’t start and coolant leaking, it’s first start after rebuild but i couldnt start it untill now, anyone have any idea? Everything is good plugs, the wires, the battery but still wont start
thanks