"For a future CD", don't bounce to MP3 -- it's lossy. If you're using Logic Express, bounce to a 16 bit AIFF or WAV file (under PCM in the bounce menu). If you have Logic Studio, bounce to 24-bit, and use Waveburner once you're ready to burn a CD.
To make a track louder, add the compressor or multipressor plug-in to either the track or the Stereo Out, depending on your preference (see the manual for use). If you have Logic Studio, you can forgo all of that until you're ready to burn a CD, then you can use the plug-ins in Waveburner (so that you easily compare the volume/tone across multiple tracks).