I've always written off my business expenses for my online stuff as a home business (option in turbotax). That's how I dealt with my income as well.
Since I did qualify as a home business I was even able to write off any classes I took at my college related to furthering my computer skills as well. Along with a 45 cent per mile credit for the miles driven to and from those classes.
Lesson learned, get a job in college and be poor, and pay your taxes...MAKE a job in college and you're set. Just make sure you're going to college for something related to your home business.
Nowadays I don't have much income from online at all (like none

) so I just file like normal.