How to build a form using a figma/mockup as my starting point?

I've been learning how to code in c# for about a month now and one of the ways I'm learning to do that is by building an application, which is a management app for a local clinic, however I started by designing the gui and such but I'm nt sure how to translate that into code, considering that I find the designer of visual studio quite difficult to use, any help would be greatly appreciated!