Make a left at the first light and follow signs to The College of Staten Island. If you're staying in Manhattan, take the Staten Island Ferry to St. George Terminal, then S62 or S92 bus to the college. You'll enjoy not only the game, but also a great trip across New York Harbor. Gates open one hour before the game. There are mini packages with as few as five games in them.
Tickets are extra.
The stadium is pretty small with only 4,500 seats so there isn't much variation. However, all the seats are close to the field. Staten Island is part of New York City but is more suburb than city, so if you want to go someplace after, you should bring a car. Check out CitySearch for ideas on things to do in the neighborhood. You can always head into Manhattan as well.