*Nothing happens.* o_o*I inhale as much air as I can. When Im finished gathering my air, I infuse some of my fire chakra into my lungs. I gather the air into my mouth and visualize a ball of fire. I add as much chakra as I can and then blow out the air very hard. As soon as the chakra infused air hit the normal air I burst more chakra out of my mouth. I then attempt to shoot out three fire balls.*
You missed a crucial step - with most fire jutsu, just having the chakra filled air hit normal air won't cause it to ignite; you have to remember that you still have the ability to manipulate your chakra at a distance - with this, you'll use the nature of fire chakra to cause an actual ignition, or a spark, which will ignite the rest of your chakra.
Everything else you did was absolutely perfect, but you didn't actually use your chakra to ignite the air.
^_^ So, try again, and mention how you use your chakra to create the flame (from here on out, I won't really require this step, as it'll be understood to function in all the fire jutsu, but seeing as this is the first fire jutsu, it's important that you know).