Help with adding UDim values to a table?

So I made a function that allows me to make GuiButtons,this function has five arguments:

.Size

.Position

.ButtonSize

.ButtonPositon

.PlayerImage

.Parent

However the size and position arguments will error on me if I try to add a UDim value to them. How will I add a UDim value to a table?

function CreateButton(Size,Position,ButtonSize,ButtonPosition,PlayerImage,Parent)
----------------------ObjectTable----------------------
local Objects = {}
----------------------Button----------------------
local Button = Instance.new("TextButton",Parent)
Button.Style = Enum.ButtonStyle.RobloxRoundButton
Button.Size = UDim2.new(ButtonSize)
Button.Text = "PlayerName"
Button.Name = "Button"
Button.Position = UDim2.new(ButtonPosition)
table.insert(Button)
----------------------ButtonUnderImage----------------------
local Buttonunderimage = Instance.new("Frame",Parent)
Buttonunderimage.Style = Enum.FrameStyle.DropShadow
Buttonunderimage.Size = UDim2.new(Size)
Buttonunderimage.Name = "ButtonUnderImage"
Buttonunderimage.Position = UDim2.new(Position)
table.insert(Buttonunderimage)
----------------------PlayerImage----------------------
local PlayerImage = Instance.new("ImageLabel",Parent)
PlayerImage.BackgroundTransparency = 1
PlayerImage.Image = PlayerImage
PlayerImage.Name = "PlayerImage"
PlayerImage.Position = UDim2.new(Position)
PlayerImage.Size = UDim2.new(Size)
table.insert(PlayerImage)
----------------------Returninig----------------------
return(Objects)
end

Button = CreateButton()
for i,v in pairs (Button) do
    print(v)
end

Oh,How would I add a instance to a table because I tried adding a instance using table.insert() and I got an error saying:

Workspace.ButtonCreator:11: bad argument #1 to 'insert' (table expected, got userdata)

How would I do it?