If you have coreldraw you can go to AdvancedArtist.com - CorelDRAW tutorials and buy some really cool plug-ins for it for designing. Plus he has a lot of free tutorials on how to design with coreldraw on that website too.
Illustrator and Corel have tutorials available as stated by other posters. Many of our customers use InkScape however as it is free. Aside from designing your artwork free-hand, it is also very common to vectorize images and then clean them up a bit. If you would like a training session I will be happy to give you one through remote desktop. Let me know.
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