Hi, How do you bounce individual tracks for mastering.. Some track dont start right at the beginning im wondering how i do this so when i re import them they all line up. thanks

Suggest you bounce out (or otherwise export) your tracks as WAV files. If your plan is to bring those audio files back into Logic (and mute your original source tracks) you can get them to align very easily by selecting them and then using the function "move region to original recording position".