I'm looking to start selling finished embroidery works and I know that useing excerpts of literary works and images without any type of credit is against copyright laws but is there anything else I have to do to be able to use them?

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Actually, your statement that "I know that useing excerpts of literary works and images without any type of credit is against copyright laws" is wrong. Copyright has nothing to do with giving credit. For example, let's say I start making illegal copies of a DVD. Can I sell or give away the illegal copies simply by giving credit to the copyright owner? Of course not -- such an exception to copyright law would be silly. If you want to use copyrighted works, your easiest bet is to get express permission from the copyright owner. Permission is the key.