Myfarm participants pay a £30 annual subscription enabling them to vote on decisions such as what crops to grow and which animals to buy. Subscribers also receive a family ticket to visit the farm for a day.
A dedicated website features video updates, live webchats, debates and comment from farming experts.
National Trust director-general Fiona Reynolds said: "The project that will give thousands of families and classrooms across the country the opportunity to experience the highs and lows and often complex decisions that farmers face on a daily basis.
As the country’s biggest farmer it’s our role to re-connect people with farming to promote better understanding and greater protection for the land on which we all depend," she added.
Wimpole farm manager Richard Morris said: "By influencing the work at Wimpole our farmers will start to understand the effects and implications of their own decisions. They will also witness first hand how unplanned events can turn a profitable year on its head."