How good are my chances at getting a deal for art or tattoo lettering?

im 16 and ive heard im really good with letters and **** like that ill draw em in class with just a pencil and sharpies and i can make it real sick ill see if i can load up pictures. But my point is how could i get someone to look at my work?

Im a freshman in college going to be a raidiologist and im thinking about getting tattoo sleeves?

I have always been inlove with tattoo at the moment i only have one on my leg but at the beginning of winter im getting a large chest tattoo. Anyway, I was just wondering if getting sleeves would pretty much disqualify me from becoming a doctor. I was thinking i could just wear long sleeve shirts right?