David Cameron has promised a "truly national commemoration" to mark the centenary of the First World War.
The Prime Minister said there would be events to mark 100 years since the outbreak of war in 2014, Armistice Day in 2018, and the dates of major battles in between.
There will also be a £5 million educational programme for school pupils, including trips to the battlefields, and support for an overhaul of the Imperial War Museum.
Speaking at the museum in south London, Mr Cameron said an advisory board of former defence secretaries, chiefs of staff and military specialists would bring together ideas for the commemorations.
"Our ambition is a truly national commemoration worthy of this historic centenary," he said. "A commemoration that captures our national spirit in every corner of the country, from our schools and workplaces, to our town halls and local communities.
"A commemoration that, like the Diamond Jubilee celebrations this year, says something about who are as a people. Remembrance must be the hallmark of our commemorations."
The Heritage Lottery Fund is also supporting work by young people to "conserve, explore and share local heritage of the First World War". Some £50 million was being spent on the commemorations in total, Mr Cameron said.
The commemorations will include the centenary of the first day of conflict on August 4, 2014, the start of the Battle of the Somme on July 1 2016, and further events to mark Jutland, Gallipoli, Passchendaele and Armistice Day in 2018.
Mr Cameron said: "The centenary will also provide the foundations upon which to build an enduring cultural and educational legacy to put young people front and centre in our commemoration and to ensure that the sacrifice and service of 100 years ago is still remembered in 100 years time."
The Heritage Lottery Fund was inviting more applications for support to mark First World War events, he said.