sw6lee said:
So once I have 1 year of experience, I am planning to apply for CEC with EE. But how do I prove that I have 1 year of experience in the future? Do I have to do anything at the moment? Or I just have to prepare proof of employment from the company when it's time for me to apply for a PR?
The main proof of work experience is a letter from your employer, which must include details like exact dates of employment, job title, hours worked per week, remuneration/benefits, and very importantly, job duties and responsibilities (this is what IRCC uses to determine whether you have performed skilled work). Additional work records include your T4 and NOA tax documents, possibly recent paystubs, possibly a job contract, a record of employment (if you have left the position), etc. that would support the facts in the letter.
You can see what is required for applications here -
http://www.cic.gc.ca/english/resources/tools/perm/express/intake-complete.asp