Hi, I'm new here, but thought I'd jump in since my full time job is Halloween. I'm an artist, and basically what began as just a few Halloween inspired pieces several years ago has happily turned into....it seems a bit odd to call it a "job", it's more like full time "FUN".
I started by selling a few pieces on eBay, got my own website and blog, opened an Etsy store and then three years ago a big break came when I was invited to participate in the prestigious "
Ghoultide Gathering" show up in Northville, Michigan. Lots of really well known artists there (and to tell the truth, I still feel like the cool kids are letting me sit at their table, haha.)
Anyway, this is what worked for me, but you don't need to be an artist to start your own Halloween business on the net. Discover your passion and find a way to market it. If you love what you do, chances are others will too.
Good luck to you!