Not sure on paid training online, but there are lot of video on youtube you could find for beginners. And better you got some films to do practice when you watching the video.
Hi i mean i never noted the gloss ppf will turn the matte finish to gloss look. For the removal, i now have tried matte ppf on matte paint already, seems my film has no issues to remove. Later I will try clear on matte paint.
https://drive.google.com/open?id=1LaemnPg8puRuet5hGyHCa4IDZQxDUzHI
It is a file with around 50 pages, a bit long story, but will help beginers to know how to install an paint protection film starting from zero.