Report-save revenu by date

Hi,
Our intention is to organize clients in 2 main groups: Leads and Active Clients ( with contract ongoing) for instance.
So this is our case study for Active Clients: in one group we have 3 clients :

  • Client 1 with 100 euro/ month, start contract on January
  • Client 2 with 200 euro/ month, start contract on February
  • Client 3 with 300 euro/ month, start contract on March

So, in April or at some point in the future, in a revenue evolution report, should we be able to observe in a graphic/ bar all these values per month (January, February and March)?

It is very important for us to obtain this type of report.

Thank you,
Roxana