Before you can start using Lure on a project you first need to set up the Lure configuration for the project, that is you need to decide in which folders all the different kinds of Oracle database objects will be stored and which file extensions to use etc. You then have to configure your Lure project accordingly. To achieve this go to Starting A New Lure Project.
If someone else has already set up the Lure configuration for your project and you are supposed to check out a pre-existing Lure project from you source code repository (e.g. from Subversion or Perforce) then go to Getting Started With An Existing Project.