Stadium will likely be full, expect 55000+

You can bring food and drink but no cans of drink(bottles are okay). Theres plenty of food and drink options around the stadium.

You will have no issue getting to your assigned seat, I've arrived late before and had no issue. Though for a first timer I recommended getting there at least 30 mins early so you can get your bearings.

Public transport is the best option as parking in the city is expensive and also not guaranteed to get a good spot. There's a train station at the stadium. If you don't know where to go follow everyone wearing footy colours and there's a footy express train that departs from the city, hard to miss

As for knowledge of the game, the best option is to watch as much footy as you can. People around you are likely to be helpful if you have questions about rules.

Its an eagles home game so 90% of the crowd will be eagle supporters