I need to find and add some script fonts please help
LibreOffice uses fonts installed in your operating system. You can have a look at Google Fonts to view and download suitable ones.
After you have downloaded the fonts follow you operating system instructions to install the fonts.
As a word of warning do not have LibreOffice open when installing new fonts.
It seems you need to have a default printer before you can see available fonts in LibreOffice, see Help Font Name
Start at fonts.google.com and search for script. (There are other sites as well…)
How to install, depends on your OS, unknown to us. Bit after installing new fonts I recommend to reboot.
OS is Linux Mint
Use Fontmanager or you may do a manual install: