When you are a PR get married and apply to sponsor your partner, the processing of your application can take from 3 to 12 months based on what country your partner is from. Some visa office are busier than others and it also depends on how well you prove your relationship.
Keep in mind though that as a dependent child who came to Canada not married, if you tell them that you were engaged to be married or had lived with your spouse in a common law relationship before you came to Canada, that could cause you to be suspected of not really having been a dependent child at the time you got your PR in which case you shouldn't have gotten it at all. If that was the case, they just might want to question their decision giving it to you so you must not overdo the proof of how long you and your spouse have been in a relationship.
If your spouse is from a visa exempt country, they can come to Canada as a visitor. If not, they need to apply for a visit visa. As a spouse of a PR who is thinking of staying in Canada permanently, a visit visa is often denied. If that is the case, you would need to wait until the processing is complete and your spouse gets PR. You can also not go and stay with your spouse in their country except for short vacations because as a PR, you need to be residing in Canada to sponsor people.