Some good links:-
http://www.thefa.com/about-football-association/history
http://www.football-league.co.uk/page/History/HistoryDetail/0,,10794~1357277,00.html
http://en.wikipedia.org/wiki/FA_Cup
http://en.wikipedia.org/wiki/England–Scotland_football_rivalry
http://en.wikipedia.org/wiki/English_clubs_in_European_football
https://en.wikipedia.org/wiki/History_of_the_English_non-League_football_system
Also mention the Hillsborough Disaster what effect that had on the english game in terms of new stadia, safety etc. There are loads of stuff you can google on this subject.
Also something which was significant to the english game was Puskas and Co. beating England in the 50's. This had a huge affect on the english game.
Also do research on these men who were key in the evolution of the game in England:-
Herbert Chapman
Stan Cullis
Don Revie
Matt Busby
Bill Shankly
Bob Paisley
Bill Nicholson
Alf Ramsey
Bobby Robson
They helped change the identity of kick and rush football towards a better way of playing.
Best way to do it is Chronologically. Thus when the FA was created when the FA Cup was created when the Football League was created. From the great teams of the decades:-
1880's Preston
1890's Aston Villa and Sunderland
1900's Newcastle
1920's Huddersfield
1930's Arsenal
1950's Wolves and Man U
1960's Spurs, Man U, Liverpool, Everton and Leeds
1970's Leeds and Liverpool
1980's Liverpool and Everton
1990's Man U
2000's Man U and Arsenal and Chelsea
The FA Cup was seen as bigger than the league title up until the 80's.
People in the 40's and 50's and 60's either didn't have a television or had only one. It was a time when sports were hardly on television and everyone came together as a family or neighboured to watch the FA Cup final.
Which is why the likes of Stanley Matthews and Tom Finney were revered.
You can talk about the advent of television how that had an affect on the game. Research Match of the Day in the 1960's onwards to the ITV deal in the 80's-90's and Sky in the 90's.
Talk about how the World cup win for England in 1966 changed the football culture in england forever. Do your research on that.
Talk about hooliganism from all the British nations in the 70's and 80's and how that changed football.
Talk about how the perception of the european cup and european competition changed when Man U under Busby competed against Madrid and how Liverpool's domination of europe under Paisley changed things too.