Dock Widget Plugin Gui looks Guide?

I recently found out that plugins can create dog widgets in studio, so I made one myself but now I'm wondering how to design it. I want to add looks to my dock widget and make it usable. I have the basic code, but I'm still staring at the screen with a headache of how.

My dock widget code, not very helpful though...

local info = DockWidgetPluginGuiInfo.new(
    Enum.InitialDockState.Right,
    true,
    false,
    250,
    250,
    250,
    250
)

local gui = plugin:CreateDockWidgetPluginGui("MyFirstEverDockWidget", info)
gui.Title = "My first dock widget"
gui.ZIndexBehavior = Enum.ZIndexBehavior.Sibling

--From here I'm just stuck.

Please, someone help.

Edit: I Solved it... answers will now not matter...