Building a project requires wide knowledge of many things.Knowing Java from school carriculum will not help much.Refresh your java and then learn some other java related technologies like JSP,servlets etc.The technologies mainly depends on your requirements..so choose the one which can help you in making your target project.
I'm not sure we'd all define "project" the same way, but it sounds like you're interested in getting into a larger, more complex effort, something beyond typical school assignments. It looks like some of the Ranch Cattle Drive assignments get into larger scale problems. Would any Drive veterans recommend that?
A good question is never answered. It is not a bolt to be tightened into place but a seed to be planted and to bear more seed toward the hope of greening the landscape of the idea. John Ciardi