2) I was going to point you to an EJB guide for JBoss tools, but there is none (there is one for Seam, but that is probably a little bit more than what you want right now). The following books have good chapters on EJB development with JBoss Tools:
https://www.packtpub.com/developers-guide-for-jboss-tools-3/book https://www.packtpub.com/jboss-as-5-development/book But since you already have a EJB developed, the getting started guide (mentioned above) should help you.
3) Get the free chapter 1 for JBoss in Action (link is in my signature). That will show you how to start that app server manually and how to deploy a simple app. To deploy your EJB, copy the JAR file (containing your EJB) to the deploy directory.