Hi Stefania,
You don't need a lot of experience in writing web-applications. I don't know this particular HF book (I had bought the David Bridgewater book) but I would recommend following their small practical examples. Just start from the beginning chapter by chapter.
Apart from that you could make a small web-application with all the techniques you have learned so far. You can think of a small address application where you don't worry about the database interaction (unless you have done that before). Just use a text file with addresses of your friends, create a Servlet that reads them, a
JSP to show them, create a Servlet to delete an entry and one that updates an address and so on. Don't try to code everything at once, just build and test slowly so that you don't start messing up.
Try to do coding
without Eclipse or other tool in the beginning so that you learn how to make a deployment descriptor and how you can create a .war file by hand. Later on you can download Eclipse 5.5 with integrated
tomcat server and see how quick you can write your web-apps with a tool like that.
Whenever you get stuck: post your code and questions on javaranch as there a lot lot of experts willing to answer your questions!
I hope this helps a bit, and enjoy coding.
Regards,
Frits
n.b. I will update my notes one of these days and please give feedback on any errors