For the offline files problem, follow the project setup advice from Kenny
https://www.reaper.fm/videos.php#pjey57lAp1k
For audio output mapping, try this one:
https://www.reaper.fm/videos.php#Hh04XZqFsic
For setting up templates:
https://www.reaper.fm/videos.php#EXvjh7FASMo