I did my own art... discmakers has a really cool online widget, you upload art into it and design your disc. They had some questions about my order, they gave me a call, I had to adjust the artwork slightly and upload-- it worked out pretty well.
About sales numbers--

okay, I'll tell you: we're talking low single digit numbers of discs at this point, but it's only really been out there for about two months, zero promotion other than word of mouth and postings like this.
Mainly, I'm really trying to not spend money I could give to my kids but also "follow my muse heart" and give people who enjoy the music the best possible price. Through CD Baby, for one disc I priced $11.29, but I give a 20% discount on multiple purchases, so if you buy two that knocks the price down to about $9 apiece-- that's a good price all around, especially when the buyer has to pay postage on top of the price for the CD, postage works out better per disc when you buy more than one.
For how many, I'd say it depends on how much you want to spend initially. You don't really get a good price break until you are doing over 1000 units, which can cost about $1500-$3000 depending on your packaging. You can do a limited run for much less, but your per unit cost goes way up-- my cost for manufacturing/media plus CD Baby's handling comes to about $7.50 per unit.
If you are going for 'normal' CD packaging, it does not work out economically to do your own disc art and packaging, your per unit price is too high and your quality won't look like commercial printing. Only if you want to do creative handmade packaging, which can be cool, especially if you know people who want to promote their crafts, but it can also be a nuisance-- then maybe that is worth it to do your own packaging and adds to the value.
For limited runs, with disc art and minimal packaging, you'll pay about $3-4 per unit. If you use CD Baby, they do all the shipping and handlng for you, also, that's cool: you do pay them $4 a disc for that.
My CDs are priced at 11.29 for one through CD Baby, the reasons for that are manifold. I decided to make the music itself free, because it was fun and I love it. I worked out my time for doing 'less fun' stuff-- my own duplication, business calls, etc... at minimum wage, and added that to the cost, then came up with that price. If I had to pay others real wages to do that I would have to sell at $15 or more.