>>389749452
What avatar did you download? Most pre-made avatars will specify what shader to use. If you're making model's materials from scratch, I recommend liltoon over poiyomi, since that'd be easier for beginners.
>>389777053
You also need to only have 1 material slot for an excellent, so whatever you're attempting to do is fucked from the get-go, not to mention you can't have transparent materials in Quest.