Before you rush headlong into doing craft shows, sit down and work up a business plan. I make quilt related stained glass pieces and have done everything from major shows to small community ones and it is a crap shoot. The last 4 years have been very hard in this economy. One show we sold nothing over $10. This is not to say don't do it, but think carefully about ALL of the ramifications before jumping in.
Most importantly, price out our items and see if they make you a profit after including cost of materials, time ( and that is an important one), cost of show including cost of transport to and from, consumables (receipt blanks, bags, cards. etc.) show materials (cash box, table, table coverings, display materials, etc.) Another thing to consider is if you are making something that a)people want and b) they won't necessarily make themselves and or c) your price is cheaper than what they could do themselves. Lastly, shows can be exhausting. On 1 day shows you need to show up a crack of dawn to set up, listen to people saying how they do the same thing and/or they do it better and afterwards break down and drive however long home. With a good show you do well, on others you are lucky to break even with expenses. And one good show does not indicate that the next year it comes around will be the same.
Some other considerations are sales tax reporting and insurance. Most good show require tax numbers and proof of insurance in advance.
So, if you age going to do crafts, pick something you love doing for the sake of doing it and not making needed cash. For that I would take a part time job waiting tables. Far more reliable.