Well if you do not know much about Java, then first I suggest going back and getting your foundation in Java strong first (cause after all JSPs are java code embedded inside HTML), then proceed to learning about servlets and then move on to JSPs.
As far as learning JSPs is concerned, I would suggest buy a book, Head First Servlets and JSP is pretty good book.
Head First Servlets and JSP
JSP Tutorial
Getting Started with Web application - JSP/Servlet
