Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
There are discussions underway to allow for unranked laddering in all formats, we still need to work out the details for how it would work. The plan is to co-mingle the ladders such that in certain scenarios unrated players could be matched with rated players, details are still very much a WIP.