When ever I don't have instructions I set the oven between 375-400degrees depending on what it is (a frozen meal, fish sticks,nuggets,etc). For sticks I would try 375. Set the timer for 15 minutes (for frozen food) and then check at 15 minutes. If that's not long enough leave them in and check about every 5 minutes or so after that until they are done.
Hope that helps.
Nuttkace