I've never sold anything myself, I've always knit items for specific friends and family (and, ocassionally, for myself!) The ways that I've seen things for sale have been: on consignment in a small yarn shop; a small display in a family owned doughnut shop, of all places!; and craft fairs (pre-holiday ones are great sellers, I would think!).
My favorite DPN's are my colored metal ones. I have a few pairs that I got ages ago, and I have no idea who made them (Susan Bates?...if you think you know, please tell me!) That's dissappointing that Susan Bates changed their needles--the chalk-board sound sounds intolerable! I've been recently looking to replace my bamboo and wooden DPN's with more colored metal ones, but I can't find them anywhere!
I don't know how many finished objects I've made, either. I think the idea is you just rate yourself compared to other knitters, based on a guess. You don't have to put an actual number or anything, just a range up to +++. If you still feel uncertain you could put FO(++?). I should probably have done that for my SPM, because I'm really not sure how fast I am compared to other knitters. I've never watched a speed contest or anything, so I can't imagine how fast they might go!
For the Lux, you could also put !Lux($). I don't know if that follows the official rules, but it's pretty clear to me!
I didn't know what ML (Magic Loop) was on 1 needle. I've heard of knitting socks on 2 circular needles, but not one. I just did a little internet research. Here's how you can knit ML with one needle.