If you're using Acid Pro to create your tracks, just follow the directions below to export them as 320 kbps MP3 files.
Once your tracks are all set, click File in the top left corner then click "Render As." When you do that, a "Render As" window will appear. In that window, you'll be able to name your file and select where you want to save it. In that same window, click the drop-down menu labeled "Save as Type" and select MP3. Under "Save as Type," you'll see a drop-down menu labeled "Template." From that menu, select 320 kbps.
Once that is all set, click Save and your track(s) will begin rendering. Once they're done rendering, you'll be all set to upload to Digital DJ Pool :)