There really is not much to do with Tomcat integration. One starting point might be to download struts2-blank-2.x.war and deploy it in Tomcat. As far as ant integration, I would need to know a bit more. Are you planning on using ant for deploying or building/deploying? I used ant a bunch in the past, but I have not been using it as much lately.
Now, for the learning Struts, I would suggest reading up on the tutorials available online. Struts2 is a very easy to learn framework (I think), and I have a set of articles that I have written personally that might help. Check here -
http://www.wantii.com/wordpress/?cat=3 The articles are listed with the newest at the top, so you might want to start at the bottom article and work your way up.
Discussion of Java, Struts, Spring, Hibernate, etc. <a href="http://www.wantii.com" target="_blank" rel="nofollow">www.wantii.com</a>