If you live outside of Canada, you have to prove your intent to return. If you have started planning your move, then include details of that. This may include things like contacting real estate agents, recruiters, booking flights, signing a lease, and so on.
However, a large number of couples who are living outside of Canada do not want to move back until their non-Canadian resident partner has PR, so that they can more easily apply for jobs. If this applies to you, then just include a detailed 'game plan' of how you want to move back. This may include:
….and so on. You should provide 'proof / evidence' for each of the points of your preparations (think 'prove it!'). For example, prints of email conversations, copies of screen chats etc.
IRCC wants to know that you have a game plan for when you move back. Where are you going to live? Where are you planning to work? And so on. If you are staying with family members or friends when you move back, it is helpful to get them to write a supporting letter stating that.
NB: It is common to receive a request from IRCC after you have applied for additional proof of your intention to move to Canada. If you get this request, just elaborate on what you provided when you originally applied, including any updated plans you have.