In the beginning you two might start arguing over real, important issues you have with each other, but over time, arguing will become such a normal, familiar way of interacting that you'll fight over just about anything. Every couple gets into it now and again, of course, and everyone needs to get tension off their chest rather than letting it stagnate. It's important to communicate openly about your real feelings and perceptions within the relationship, even if those feelings aren't pleasant; but you two will probably go well past that boundary together.
You'll annoy each other frequently, because the ways you talk to each other will be pointed, aggressive and rarely kind or sensitive. In short, you'll talk to each other not like lovers or friends, but like enemies issuing a challenge. You'll become more and more sensitive to each other over time, too, so that after a while, it will be difficult to say anything to your partner that doesn't come across as inflammatory. You can avoid this eventuality, however, if you're aware of your argumentative tendency from the start. You can both make the effort to pay attention to how you speak to each other, and try to differentiate between real, important issues and petty disagreements that don't merit the trouble of fighting them out.