>>1
Art is problematic, when it comes to calculating possible profit. When it comes to stuff made creatively, people are flaky.
And if your art is well made, 5 dollars sounds to good to be true, and people might think you are trying to trick them or something. If you can, raise the price (maybe to 50+ $).
For reaching lots of people as a starting artist...start with networking.
Get to know people, who appreciate and collect the style of art you create.
With the help of them, get to know more people, show them your artworks, and let them talk about it in their circles, effectively freely promoting it. If anyone wants to have it, sell it to them, and make it look like you are giving them a discount.
This is as far as i know. Take it with a grain of salt and think it through, before commiting.