When I first began selling, I used to have a ton of stuff in the description pane--in fact, I even wrote little short stories as description. Six years ago that worked like a charm and I got compliments along with my sales--one buyer liked my descriptions so much that she plastered them all over Facebook. But these days, a lot of description apparently just annoys already-impatient people. Cell phone buying has changed the marketplace completely.
From my experience of the currect market (and my sales have been way off lately so you may want to take this with a grain of salt): Most selling will take place from the title line. Descriptions should be quite short and very clear--and buyers may never see them anyway (on cell phones, seeing the description requires an extra click that some buyers cannot be bothered to make). Item Specifics need to be filled in wherever possible and these should repeat the information that is in your title and your description.
And if you do all that.....guess what? Your buyer may still not get the relevant information. (Happened to me last week--even though I had listed the size of a bandana in no less than 3 places in the listing, the buyer didn't catch on.)
The important thing to take away is this: do your best and see what happens. You can always adjust and make changes if your items fail to sell. And you're doing the right thing to ask for help from experienced buyers--that shows a determination to succeed.
One more thing--keep any sales chatter (requirements for payment and what will happen if the buyer doesn't and so forth) in the description area to the absolute minimum because it can drive buyers away.
