As everyone is aware, I'm a starting illustrator.
I was really lucky to have worked with someone I trusted who I got along swimmingly! I'll write my experience at a later time, but for now, I thought I'll put up other's blogs that I follow here that really helps if you're an illustrator wanting to do some work for people you don't know!
Hire an Illustrator:
http://www.hireanillustrator.com/i/blog/1033/hiring-a-childrens-book-illustrator/
Amanda Hall answers really helpful Q And A
http://www.amandahall-illustration.com/faqs/getting-paid/
Writing contracts?
http://businessofillustration.com/go-illustration-contract/
http://www.hongkiat.com/blog/freelance-contract-clauses/