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.
[Edit]
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…)
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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: