I've been using Gimp since version 2 came out, first in windows, now in linux and I'm still not very good and still learn something new each time I use Gimp. So persevere.
In general google is your friend. Do a google search for
gimp +youtube +text +effect
and see if anything appeals.
Otherwise some that I know of.
25 GIMP Video Tutorials to Help Get You Startedhttp://sixrevisions.com/graphics-design/gimp_video_tutorials/
Some videos here, but mainly non-vid, look for the small arrow icon. Also one section for video tutorials.http://www.gimp.wisdomplug.com/category/Text-Effects
The same here, videos are usually labled as such,http://gimpology.com/
Meet The Gimp
For general image editing, a blog, not really tutorials and Rolf can be long-winded, but some great info. The early shows started in 2007 and Gimp was at ver 2.4.x so be prepared to 'read between the lines' in places. I still think the first two 'episodes' are great for beginners. http://meetthegimp.org/getting-the-old-shows/
For a text effect maybe try this onehttp://meetthegimp.org/episode-057-blood/
best of luck