IMHO the best way to learn how to make a quilt suitable for giving to a professional LAQer is to learn to DIY from start to finish. If I screwed anything up then I will surely learn what made it difficult to quilt on a DSM, and then try to remember not to do it the next quilt.
I've been quilting for just three years and never sent a thing to get LAQ'ed. Still not satisfied I've got a product could stand up to the treatment. Plus, I know where the difficult spots are - where seams in a block join in a nightmare cluster despite best efforts, or where rows joined up with difficulty in spots, or one mitered corner is a bit shaky, etc. - and I quilt around them. (If you LAQers can deal with all that fussy stuff, shout out and correct me
)