if you wanna make a GUI of the job then 
function createaMarker () 
 createMarker (-1645.7694091797, 433.41793823242, 7.1796875) 
end 
addEventHandler("onClientResourceStart", root, createaMarker) 
 function guiSetOn () 
 guiSetVisible(youWindowVariableHere, true) 
 showCursor(true) 
end 
addEventHandler("onClientMarkerHit", root, guiSetOn)