Generally, income of $1200 a year (your max)  needs to be reported, but is a drop in the bucket in the grand scheme of things, so I wouldn't sweat it too much. 
If you do work for businesses, you will need to fill out a W9 for them, and they report your income if they pay you more than $600 a year (that's what we do with our contractors). If you do work for individuals, it is solely your responsibility to report. 
If you need a business name and everything associated with it - go ahead and file schedule C at the end of the year. Otherwise - just claim it as a hobby with irregular income and don't report it. At least for the first year. If it starts ticking up - make it proper and formal.