Modify and Fix NSIS Nullsoft Script that creates Installer. Please don't bid if you don't know about Nulsoft

We do have a MSI File and a Nullsoft Script that basically is creating an EXE file. The Nullsoft script is the one that is in change of request different settings from the user at the moment of the installation and creates a config file with all the settings that the MSI installer will use to install the application properly.. This is working as it should, however we need to do some changes. 1. We need the Nulsoft Script to install the SQL LOCALDB database, create an instance ID, create a Database, create the SA user and assign a passwd. 2. We need to create a Silent installation of the actual installation using Nullsoft. 3. We need to be able to uninstall the database when our client app is uninstalled. Will provide the MSI and additional files when the project is awarded.