"Write the net ionic equation for the reaction between AgNO3(aq) and Na2SO4(aq). Be sure to include states of matter in your answer."

I only have a vague understanding of oxidation numbers and am not very familiar with them, but I am good at balancing equations and determined that the balanced equation is
2AgNO3(aq) + Na2SO4(aq) --> Ag2SO4 + 2NaNO3

I don't know exactly how to proceed from this step, and help would be greatly appreciated. Thank you! :)