I plan to sell prints of my artwork online. Do I need a business license and all that?

Can I just claim the income as self-employment income and be done with it, or do I need a business license?  I figure that if folks in my home state buy the prints I will need to charge them sales tax and then pay it to the state?  Is that true?  How do I do that?

Thanks so much in advance for your response.  I'm having trouble figuring this all out.

Thanks,

Yernar