Well, on the main page of this site,
www.photoshopgurus.info , you find a lot of tutorials. Even if you are experienced, it is always good to take a look at the beginners and then the intermediate section. Because Navbars and so on do mean you need to have a sound basic knowledge first.
I would suggest you look at these, and ask any questions you need when you get stuck somewhere.
The advanced section is about navbars and so on. YOu can read it, try things out, and see whether your knowledge is already so that you can do all these things yourself.
But never hesitate to ask when something is unclear, ok?
[righton]