I can't make the skript for you, but I can give you documentation links and tutorials. There are two main solutions for guis there is skript-gui addon (which can be installed in the plugins tab) and vanilla skript (which comes when you install skript). I recommend vanilla skript, but neither is bad.
For skript-gui:
Tutorial: https://github.com/APickledWalrus/skript-gui/wiki
Documentation: Search for syntax by filtering only skript-gui, https://skripthub.net/docs/
For vanilla skript:
Tutorial: https://forums.skunity.com/threads/vanilla-guis.8939/
Documentation: Search for syntax by filtering only Skript, https://skripthub.net/docs/