I like to know if it's possible to do a carousel slider, that when we click to a photo we go to a different webpage.
This is possible in Juicebox-Pro but not in Juicebox-Lite (the free version) by setting imageClickMode="OPEN_URL" and assigning URLs to the images via the linkURL entries on JuiceboxBuilder-Pro's 'Images' tab.
Can we also setup the image/page start in the slider?
I'm not quite sure what you mean but it sounds like you might want to use a Splash Page.
The Splash Page is a placeholder for the gallery which, when clicked, will open the gallery fullscreen.
Please see this sample gallery for a demonstration.
For more information about the Splash Page, please see here.
The Splash Page can be configured using these (Pro-only) configuration options. With Juicebox-Pro, you can force the Splash Page to always be displayed by setting showSplashPage="ALWAYS".
However, if all you want to do is choose the first image in your gallery, you can order the images in exactly the order you want on the 'Images' tab of JuiceboxBuilder-Lite (by dragging and dropping each thumbnail into a new position).