Hi everyone!
I've been trying to figure out the process myself and thought I'd pass on what I've learned.
1) You need a business license and seller's permit to vend in most cases
2) Depending on what your business type is, like an LLC, you will receive an EIN, which is especially useful in purchasing wholesale materials. You can apply and do all this online through the Nevada state website.
3) You will have to report your sales activity via your personal SSN, if you are a Sole Proprietorship, or your EIN, if other, but you can write off anything related to your business. Gas, electricity, materials, meals, etc. This will be written off against your earnings when it comes to tax time.
I encourage a lot of research. Just research, research, research, as we are all so lucky to live in an age where we can easily find information via internet. Hopefully this helps and good luck!