Go to http://www.cic.gc.ca/
Go to the immigrate section and to the sponsor my family section and to the sponsor spouse section. You can find all the requirements for who can sponsor. Also find the application forms and read the application guides. They will tell you in more detail.
It does say in there somewhere that if you are sponsoring only a spouse and/or children that income restrictions do not apply.
Just a word of warning though, you are very young, you need to be sure that this is the real thing. There are a lot of cases where people use marriage just to get visa. A lot of people have been convinced their marriage was real only to find out their spouse ran away as soon as they got the PR. If that was to happen to you, you would end up not just with a broken heart but possibly deep in debt. Sponsorship should be taken seriously like they say on the CIC website and if your spouse decides to go on welfare or disability, you are responsible to pay it back for 3 years after he becomes PR.