Hi Tara, and welcome! We are new here too...haven't sold anything yet but we sure are having fun. From what I have read, here is a good place to start.
Get a portfolio together of at least 50 high quality, high resolution images. High res is key...you want to sell BIG prints!
Work really hard at growing that portfolio. Keep it fresh by updating it often. Make galleries with descriptive titles and cover images to catagoize your work. Try to get to 100 images or more! The more the better. Have 500 by the end of the year and keep going.
Have descriptive titles, accurate keywords, and descriptions. Imagine you are an art buyer. What keywords and phrases are they searching for? Be specific!
Participate in everything on FAA to gain an internal following. Like and comment on other art. Follow people! Join groups and contests. Write a nice bio from yourself, and update it once in a while.
Participate in even more stuff outside of FAA. Social media is a must.
Have fun and good luck!