Just read this here manual. It will tell you all that you need or just what they are looking for. Just telling you now it does seem like a stressful list but it is plenty possible for to succeed if you work hard enough for it.
http://www.cic.gc.ca/ENGLISH/RESOURCES/manuals/op/op02-eng.pdf
Here is a list of stuff they are looking for:
• Joint bank accounts and/or credit cards;
• Joint ownership of residential property;
• Joint residential leases;
• Joint rental receipts;
• Joint utilities accounts (electricity, gas, telephone);
• Joint management of household expenditures;
• Evidence of joint purchases, especially for household items;
• Correspondence addressed to either or both parties at the same address;
• Important documents of both parties show the same address, e.g., identification documents,
driver’s licenses, insurance polices, etc.;
• Shared responsibility for household management, household chores, etc.;
• Evidence of children of one or both partners residing with the couple;
• Telephone calls.
And this:
Financial aspects of the relationship
• Joint loan agreements for real estate, cars, major household
appliances;
• Joint ownership of property, other durable goods;
• Operation of joint bank accounts, joint credit cards evidence that any
such accounts have existed for a reasonable period of time;
• The extent of any pooling of financial resources, especially in relation
to major financial commitments;
• Whether one party owes any legal obligation in respect of the other.
Social aspects of the relationship
• Evidence that the relationship has been declared to government
bodies and commercial or public institutions or authorities and
acceptance of such declarations by any such bodies;
• Joint membership in organisations or groups, joint participation in
sporting, cultural, social or other activities;
• Joint travel;
• Shared values with respect to how a household should be managed;
• Shared responsibility for children; shared values with respect to
child-rearing; willingness to care for the partner’s children;
• Testimonials by parents, family members, relatives or friends and
other interested parties about the nature of the relationship and
whether the couple present themselves to others as partners.
Statements in the form of statutory declarations are preferred.
Physical and emotional aspects of therelationship -the degree of commitment as evidenced by:
• Knowledge of each other’s personal circumstances, background and
family situation;
• Shared values and interests;
• Expressed intention that the relationship will be long term;
• The extent to which the parties have combined their affairs, for
example, are they beneficiaries of one another’s insurance plans,
pensions, etc.?
• Joint decision-making with consequences for one partner affecting
the other;
• Support for each other when ill and on special occasions letters,
cards, gifts, time off work to care for other;
• The terms of the parties’ wills made out in each other’s favour
provide some evidence of an intention that the relationship is long
term and permanent;
• Time spent together;
• Time spent with one another’s families;
• Regular and continuous communication when apart.
Examples of supporting documents:
• Family memberships, medical plans, documentation from institutions that provides
recognition as a couple;
• Marriage certificate (not just a solemnization record), wedding invitations, commitment
ceremony (certificate, invitations), domestic partnership certificate;
• joint ownership of possessions, joint utility bills, lease/rental agreement, joint mortgage/loan,
property title, joint bank statements; money transfers.
• documents showing travel together, long distance phone bills; other proof of continuous
communication (emails, internet chat site printouts, letters).
• insurance policies (documents naming the partner as a beneficiary), wills, powers of
attorney;
• significant photographs;
• statements of support from families, bank manager, employers, financial professionals,
religious leaders, community leaders, professors, teachers or medical professionals.
Hope this helps and yes you can live together by the way you planned it. And you can apply for an extension during your stay but if you are denied you go back home. However, just provide them with a copy of the application and receipt showing you paid for the application and make them aware that you are waiting on the response of your permanent residence and you shouldn't have a problem with it being approved.