It looks like you aren't giving liquibase a command.
It should be something like this:
D:\Liquibase>java -jar liquibase.jar [command]
There are a lot of different commands you can give to liquibase. Running liquibase with '--help' should show all the commands.
The commands you may want to start with are generateChangelog (will generate a changelog from and existing database) and update (will update a database and apply all un-applied changes from a changelog)
No, Oracle client is not a prerequisite for SQL Server.
