I am not sure what you mean with the bracket? You have 2 slots on the back side of the tank, these should have the size of the tubes for the inlet and outlet of your tank. Then, the hood has some slots as well and normally has some extra wants that you take out in case you use another type of filter. Your filter came with the kit, right?
No, you have probably set up your filter correctly. However, there is still air in the tubes that you need to get rid of first. That is why you prime. Follow the instructions for priming. It is normal to have to prime several times before getting it to work correctly. If you have a chance to see your tubes, you should see how the water level rises in your tubes every time you prime. It is also normal to see bubbles coming out of the outlet or even the inlet.
Good luck!