I can see that no one has answered your question so I will.
Here is a list of games that will be on SEC Network the first 4 weeks of the year:
http://www.secdigitalnetwork.com/NEW...our-weeks.aspx
If you do not have SEC Network you will not be able to watch those games. All the others will be on ESPN, ESPN2, ESPNU or CBS. There will be 3 football games per Saturday on SEC Network - all the other games will be on channels you currently have.
Essentially what is happening is all the games that used to be on Jefferson Pilot/Raycom, Fox Sports Net and CSS will be on the SEC Network (which is why CSS is closing their doors).
You will not be able to watch the SEC Network games via ESPN3/WatchESPN app because the SEC Network will also have it's own digital platform similar to that...and your internet provider will need to carry the SEC Network for you to have access to it. So.....if your cable provider doesn't have the SEC Network but your internet provider does then you could still watch the games streaming, however, you likely won't get to watch the Finebuam simulcast in the afternoons*.