How can I create a user interface in AutoCAD?

Thanks for your invitationAgreed with colleagues answers..

Please watch video to create a user interface.

https://www.youtube.com/watch?v=STvSaJ_Pvpw https://www.youtube.com/watch?v=i1Sj6e8czmUhttps://knowledge.autodesk.com/support/autocad/learn-explore/caas/CloudHelp/cloudhelp/2016/ENU/AutoCAD-Core/files/GUID-27573791-DCEE-4751-A18A-7E54E773BEF6-htm.html  

Thank you for the invitation

Agreed with colleagues

To create a new toolbar, begin by clicking the Manage tab of the ribbon, Customization panel and then select User Interface. In the Customize User Interface Editor, Customize tab, right-click Toolbars in the Customizations In <file name> pane. Select New Toolbar.

Agree with previous answers

Automate repetitive drafting and editing tasks by recording action macros. Use most of the commands and user interface elements that are available in AutoCAD to create your action macro and then save it. You can find the Action Recorder on the ribbon's Tools tab. Store commands that you frequently access in AutoCAD.

everything you change ( select - model - layout colors ) is automatic saved but you can save it with a name by pressing option ( profile ) 

also there is the customized user interface as answered by Imad Habash

everything about AutoCAD is available in AutoCAD itself. Just press F1 after opening AutoCAD , and AutoCAD will help you understand itself. 

The Customized User Interface (CUI) editor allows you to provide and modify many of the user interface elements.try to read and follow these LINK1 and LINK2 to get help.