I dont know where to start with UI Design and Constraints

Not to be that guy; however, you may find better luck in the #help-and-feedback:art-design-support category.

None the less, here are some references you could explore.

There are plenty more great resources on the forum that you should be able to find relatively easily through the search bar.
Also though, I really like simply using devHub as a reference. Roblox Creator Documentation
If that isn’t enough, try looking up YouTube tutorials. In this day and age there are more tutorials on the internet than you could navigate in a lifetime.

If you still got some more specific issues you are struggling with, just let me know or as mentioned earlier, use the proper category.

Thank you,
SagaciousWizard

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