Riiker, I think I started Voss around level 45 or so. I doubt you'll hit 50 with just Voss and Corellia to go. Here's something I found very helpful: get to 47, then head back to Belsavis. There will be a bonus series that opens up that will give you about 15 or so daily quests to do (3 of which are heroics that are challenging but fun). Level up to 50 by repeating these each day. In addition to faster XP than Corellia, you'll be making plenty of credits and earning Daily Commendations which can be used to buy some great gear (though you need 120 or 200 of them per piece). Much better way to finish out leveling and give you a boost into the credits and gear you will want at the end game.