Welcome

Good advice from Rip...
As far as supplements...all you really need to get started are a good multivitamin (as with all vitamins you should make sure they are natural nit the crap they sell you at Walmart like centrum) the GNC Mega-Womens vitamin is a natural vitamin or if you have a trusted store by you.
Get on a good EFA, you can do fish but my favorite blend for females has Evening Primrose Oil in it...take 4 a day, 2 before breakfast and 2 before dinner. Unless you are eating sushi and lots of raw nuts you aren't getting enough good fats. Really you can't overdo these...they are hard to store and actually help you gain lean muscle without added weight.
If you aren't eating enough green veggies you could get a green supplement. If you aren't getting enough protein you could get a clean whey isolate (easy way to check your protein is look at the cholesterol, if the cholesterol is over 10 mg per 25 gram protein serving it is BAD).
Start with these basics and see how it goes. I could go on and on about the good things you should be taking...acidophilus, ester c, vitamin e, b vitamins, MSM, glucosamine, glutamine, etc.

ask me any questions you may have.
If you like ordering online a good store with natural vitamins is
www.trustnutrition.com, they are reasonably priced and get your stuff to you quickly.