You'll have to wait a few more years before you can apply for citizenship. Currently, you need to live 3 years out of the last 4 in Canada in order to apply - and two of those years have to be accumulated after you become a PR. So it's too early for you to apply under the current rules.
The new rules are expected to come into place this summer. Under the new rules, you must live in Canada for 4 out of 6 years to qualify for citizenship. Time spent living in Canada before become a PR will no longer count. You will fall under the new rules for citizenship since you will be applying after the new citizenship rules come into place. So it will be 2018 at the earliest before you will qualify to apply.