What is it that you don't understand? How to do the laser beams? How to do the beams hitting the target ship?
One thing that's always bugged me about most space battle scenes is that you should almost never see two ships sitting side by side pouding each other. It looks cool, but these ships should be in weapons range long before they could see each other, much like navel ships on the ocean today.
That's my two cents, spend it how you like.