ChristineAngelHart: I beg you not to take Kascha's advice. First of all, you'll want quality items from trusted creators.
Second, a makeover can be had for close to NOTHING if you look in the right places. Perhaps try http://slfreestyle.blogspot.com/ where they regularly highlight free and cheap LEGAL items on the grid. They're quality items, and you'll see everything from skins to hair, shoes to eyes. At the very least, it will introduce you to countless new stores, places to explore, and show you what quality products are in SL.
There are groups you can join where excellent quality free gifts are regularly sent, like skins and hair. You may pay once to join the group, but the gifts usually come often enough to justify the entrance fee. Also, most in-world groups reward you with group discounts on your purchases, and/or store credit towards future purchases. They're definitely worth checking out.
If you want to spend money, by all means read the SL fashion feeds. Try http://iheartsl.com/. It shows hundreds of fashion bloggers in SL, with a variety of personal styles, one or two of which are bound to suit your needs. Again, at the very least, it will introduce you to countless new stores where quality products can be had.
If you want, you can IM me in-world and I'll give you a folder full of landmarks for good skins, hair, eyes, clothing, shoes, you name it.
You may also want to try Expos/Fairs, where hundreds of content creators gather on one or more sims to raise money for charity. You'll be getting great items, and giving back. Plus, it makes shopping easier because so many stores are in one spot. There are regular fairs held several times per year, like Skin & Shape Expo, Shoe Fair, Hair Fair, you get the idea.
Stay out of Yadni's Junkyard, which is appropriately named because everything in it is either stolen or GARBAGE. Nothing good ever comes from Freebie Dungeon or Freebie Store B. The items are woefully outdated (mostly from 2007) and much of it was illegally obtained. There's absolutely NO reason to wear trash when so many quality items can be found cheap or even free. Don't support content theft. Support content creators.
Good luck!