Your question is still vague, however, if you want to know which forms you have to fill, refer to this site:
http://www.cic.gc.ca/english/information/applications/student.asp
In case you apply online, they system will ask you several questions and then an automatic checklist will be given with all forms you need to fill.
Remember you need to fill all fields applicable to you, no one should be left.
The last thing, it's highly recommended to write an SOP and attach your previous mark sheets and IELTS score.