Project - Energy consumtion meter

I want to make a simulink model which shows the energy consumption by a load (eg Bulb) using 3 different LED's (low, medium, high)

Just wanted to know how exactly can I start with this project and what all should I require to make this model.

Basically I just to lit up specific LED based on what the energy consuption by the device is.

Can I get some idea and process on how to start with it.

Need to complete it withing a week so urgent help needed