A Clone() Problem?

This is the current function that i use to place my maps. How do i make it more secure? Sometimes it does not even load parts (walls) anything more secure? Or just plain efficient?

function AddField()
Fields = Game.ServerStorage.Fields
Chosen = Game.Workspace.Chosen 
Randomize = Fields:GetChildren()
Picking = Randomize[math.random(1,#Randomize)]
Chosen.Value = Picking.Name
FieldAdd = Game.ServerStorage.Fields:FindFirstChild(Chosen.Value)
FieldAdd:Clone().Parent = Game.Workspace
FieldAdd:MakeJoints()
end

It makes it connect to the original model so try parenting it to something like so:

function AddField()
Fields = Game.ServerStorage.Fields
Chosen = Game.Workspace.Chosen 
Randomize = Fields:GetChildren()
Picking = Randomize[math.random(1,#Randomize)]
Chosen.Value = Picking.Name
FieldAdd = Game.ServerStorage.Fields:FindFirstChild(Chosen.Value):Clone()
FieldAdd.Parent = Game.Workspace
FieldAdd:MakeJoints()
end

No I did not take other dude's I just have same answer because there isn't much more I know to clone

makeJoints()*