How do i placed an object to current mouse position?

I made a script that will clone a model from replicatedStorage and once it's load when left mouse is click the model will be placed on player mouse position so basically a dragging script.

my problem is i have no idea how will i be able to placed the model down, because basically whenever i click left mouse again it positions the model. I was thinking when right mouse button is click but i have no idea how the model will stay.

http://imgur.com/a/mLpl0