The French we can handle. One way or another.
Let me explain that many (or most) people who answer here will not respond to a request with a meaningless or irrelevant title, largely because they feel it suggests the questioner simply has not researched the topic at all.
For your situation, you need to explain the purpose of this project as much as the expectation - because there may well be a much more appropriate way of performing the task, quite possibly not using an Arduino at all (and a DUE is manifestly "overkill" for what you describe - it is perhaps unfortunate that your previous enquiry as to which Arduino would be most suitable to start with, was not answered either).
Before asking the question you also need to start familiarising yourself with the Arduino platform by following necessary tutorials in setting up the IDE - the development environment - and successfully executing a variety of "sketches" to perform individual steps of the task you describe such as controlling one or more LEDs and receiving input from the PC via the "Serial Monitor" facility.
It would also seem that what you describe requires programming on the PC which is not in itself the ambit of this board, but most certainly a clear explanation of the purpose of your project would be critical to any further advice.