Shakey.
to change the sample rate, you need to export every single track individually to the new sample rate
to change the bit depth from 16 to 24, you need to bounce it to that bit depth.
you can do both with exporting them. Have fun,m cause it will take you a while to do it...
Next time try and record at the same sample and bit rate of your chosen.
Before recording, set your sample and bit rate. Then you wont have to deal with what your getting yourself into
to change the bit depth, you go into options/glabal/audio data. you can have a [project witrh 16 and 24bit depths. you cannot have a project with different sample rates.
Cj