Will my "business" become successful?

1. You can use an Image Uploader, like Photobucket, to upload your photos, and then post the link so people can click it to see your art.
2. You will need a business license to sell your art. It's not lemonade, and even THOSE need permits anymore. Every summer kids get shut down and ticketed for not having a permit.
3. Before you go gung ho, try framing and selling your art to those people who say they would buy it. Have them back those statements up.

Sell your art for .25 a square inch (and 8x10 would then be 80 sq. inches, or $20, plus the cost of the frame. If people balk, lower the price per inch. This will show you how much of a market you truly have.

Best of success to you.

Selling them on the street isn't the way to go. Even lemonade stands are a thing pretty much of the past.

You'd do better by having a parent open a free Etsy store for you and posting images of your art there. That way you won't have to invest in framing, OR have to do large print runs of the art. That's a waste of money to invest into prints before you know if they'll even sell.

See if kids from school want to actually buy any. Many people say they like something but they don't actually buy it.