I don't live in Nevada, so I can't answer specifically for your state. However, the information is easy to locate.
Every state law on sales tax applies to any retail sale--that is, a sale by a person whose goal is to make personal profit (which is different from "fundraisers" where all income goes to the exempt fund--if you rent a booth at a fundraiser, you are still aiming for personal profit). Your state wants to collect the tax, not prosecute you, so they make it easy for you to get your questions answered. This is from the Nevada Department of Taxation:
"The Nevada Department of Taxation has established a new call center to address questions regarding sales tax, use tax, modified business tax, general tax questions or information regarding establishing a new account. The call center can be reached at 866-962-3707. The call center hours are from 8:10 am to 11:50 am and 1:00 pm to 4:45 pm Pacific Time. The call center is closed for lunch between 11:50 and 1:00 pm Pacific Time."
In my state, you might not need a business license or you might need one on a county-by-county basis. Apparently in Nevada, there is a state-wide requirement that you should know about even if it does not apply specifically to you. Read about it here: http://www.nvsos.gov/index.aspx?page=267
In all likelihood, you will have to file and ask to be exempted from needing a state business license. According to the FAQ, a number of entities are exempt, including
"These businesses must still initially submit the form, WITHOUT FEE stating the specific exemption."
"(c) A person as defined in Title 7 of the Nevada Revised Statutes, who operates a business from his home and whose net earnings from that business are not more than 66 2/3 percent of the average annual wage, as computed for the preceding calendar year pursuant to NRS Chapter 612 and rounded to the nearest hundred dollars. The average annual wage generally fluctuates each year. 66 2/3% of the average annual wage for 2010 is $26,241. "
In other words, if you don't earn more than $26,241 from selling your crafts, after subtracting your expenses from your sales income, you have to file the inital request and ASK TO BE EXEMPTED.
In addition to just wanting to comply with the law, remember that once you have a tax number and collect sales tax, you no longer have to PAY sales tax on the raw materials you buy.