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Have you watched tutorials on yourube I am sure there are many sorry I cant help any further with this.
There's also one major flaw with typesetting in Gimp - you cannot edit those text layers in Photoshop. Which means you'd be either forcing the QCer to get Gimp him/herself or point out all of the prospective mistakes to you and wait till you fix them (much less practical). So yeah, I wouldn't recommend it.