Corbyn's Shadow Chancellor, John McDoonnell, makes a start by outlining that program in The New Statesman:

What is needed in a crisis like this is urgent government action to shore up investment, already falling before the vote. Shovel-ready projects should be brought forward, creating jobs and focused on beginning to rebuild those parts of the country currently most deprived - and where the vote to Leave was strongest. As a country, we will get through this crisis, and we will do so when we no longer tolerate a situation in which too many of our people are excluded from even the chance of prosperity.

Elsewhere in the article he stressed the importance of ending austerity

"It is not necessary to have hope in order to persevere."