I wouldn't use Sonar to create a CD master for duplication (I have Sound Forge, which comes with
CD Architect), but I think you could if you want to. Just mix all your tracks and export each one as a separate wave file, import them back into Sonar (I would bring left and right
separately into two mono tracks) in the correct order (leaving 2 seconds between tracks). Listen to the album for discrepancies in level and EQ. If you find outrageous peaks in a few places use a volume envelope to manually even those out. There are lots of online
tutorials on how to "master," (there's a lot to it) and you can hang limiters and equalizers over the master bus to get your album sounding right (I'm assuming you have good monitors). Contact your duplicator for their requirements and export the file to whatever they recommend.
I'm not saying this is the
best way to do this, but it should work, and if you've never done it before you will learn a lot. If you follow the link above to CD Architect you will see why a dedicated CD mastering application might be better.
Best of luck!