So I've been Googling, but I keep finding partial answers to my questions -- I think I must be typing the wrong things in. Basically, this is what I want to do:

Set up "legally" so I am registered as a small business, and can account for any money garnered through affiliate links, and pay taxes on it as a side business, with a tax number for said business.

I am planning on getting more regular with blogging about sewing/crafting and while I have zero intent or ambition to have it be "full-time" job I know that if I link to Amazon or Ebates, etc. that I have to legally point that out, and then pay taxes on the earnings.

Anyone already done/been there that can give me the skinny on the best way to do this? Am I making any sense? I just want to do it right from the start!!