Hi Holly,
Your shop looks like it's off to a good start, you even have a few sales! I would recommend working on your photo lighting, maybe some natural light would be best. I see a little glare from a flash or not enough light on other photos. Also create your about page to tell your customers a little more about you. I looked at your tags as well, you might want to consider adding the colors of the items in there as well.
The red line slashing through is using an outside system called Etsy On Sale. I use it for my major holidays, it really helps because I have over 300 items and that would take so long to edit each individually. If you want to check it out, here is a referral link that would get you some extra credits to use.
http://www.etsyonsale.com/sellers?referralCode=W66ZPW019FThe drop boxes for choices are called variations and can be found when you add or edit your listings. You can change the color or quantity there however you would like.
Lastly, vintage jewelry would fall under the category of "vintage" which makes it alright to sell even though you didn't make it. Etsy is for handmade, supplies, and vintage.
Hope all that helps, good luck!