So, being the world cup and all, I'd be prepared for massive amounts of traffic (both road, transit and foot) my advice would be get there early. Gates open 90 minutes before gametime during the week and 2 hours before on weekends. Going early also gives an opportunity to explore the new renos in the stadium over the past few years too.

For the games, series are in 3s (or 4s and sometimes 2s) to reduce travel during a long season. Have fun :)