http://www.cic.gc.ca/english/information/applications/student.asp
You can get the document checklist and the required forms for your country here^
Requirements of embassy for study permit....
1. Canada application form( 4 forms available on CIC website)
2. Statement of purpose (SOP, write 2-3 pages)
3. Acceptance letter from university
4. Offer letter from university
5. Evidence of fee paid to university
6. IELTS photocopy ( must be notarized from notary public)
7. All educational documents photocopy (attested from hec, ibcc, and notarized from notary public: For Pakistani applicants only )Note: This is for paper based application since they wont return your original certificates, you can upload original certificates if you are applying online.
8. Bank statement( original documents of bank which shows your details of account and it must be six months old account. It can also work with 4 months if you pay the tuition fee for the first semester/year upfront)
9. Source of income( How much do you and/or your sponsor earns; you would have to show payslips and bank statements to show that. You also need to show property of 2-3 crore or above. It would be better to do you)
10. Family registration certificate (FRC from nadra) original
11. Police clearance certificate original
12. Polio certificate original
13. Your NIC and your parents NIC's photocopy and must be notarized
14. Your original passport and all pages of it photocopy
You need to show a minimum of: tuition fee for the first year plus 12000 CAD as proof of funds but the more the better. It would be highly recommended to pay the tuition fee for the first semester/year upfront as it would make your case pretty strong. Make sure the University has a 100% refund policy in case of a refusal.
Make sure to state your purpose and future plans in your SOP like what will you do with your education back here in Pakistan and also makes sure to show ties with your home country (properties, investments, ties with family members etc) that will compel you to leave Canada at the end of your stay. These two are the common reasons of refusal so you have to work on these.
Also check this website:
https://www.canadavisa.com/canada-immigration-discussion-board/forums/international-students.2/
If you have any query, you can ask here as well. This forum helped me a lot when I applied. I hope this information helps you.
Note: Your brother in Canada would make your case weak since you have a reason to stay in Canada after your studies and just like your brother didn't leave, they would assume that you wont either. Make your father your sponsor and you need to explain very convincingly that your case is different from your brother's and you will leave once your studies are completed.