A.J.
I've been using at-home hair dye since I was about 12 =) my natural color is a light brown and I've dyed it different shades of brown and blonde and also reddish colors and even black LOL if you already have reddish tones in your hair and use some of the red colors, it can turn out a little orange-ish, I think that's mostly when you use the strawberry-blonde dyes. If you're uncertain on how it will look, dye a small section of hair in an inconspicuous place first. After you wash out the dye, use a hair dryer to dry the section of hair completely so you know what it will look like (remember the dye will fade slightly in the first couple days though)
I prefer the L'oreal brand dyes or Herbal Essences. They aren't too expensive, but will last longer than the really cheap brands
Hope this helps!