I need to get the camera to move with my character, how can i do this?
Basically, you keep a reference to the character in your World subclass and have that world's act method determine when the character is outside its bounds. Anytime it is, move all actors (including the character) so that the character is back in bounds and adjust the background, if needed.
Is there any way to get the camera to scroll up and down with the character, as the world is quite big
I gave a brief description of what was needed for this. Yes, there is a way. Mind you, however, there are limits that may need to be addressed -- such as heap space and excessive CPU usage that can cause lagging.