I've done about 6-8 hrs of sketches and colored illustrations for a client and believe it was time to introduce a contract before continuing any further illustration work. It's generally an uncomfortable thing to do (especially it's for a close friend) but we're both working on a professional project and deem appropriate to do.
What form would you recommend using to submit with preliminary sketches? Are there any free ones online? I not interested in a formal/full design contract - which I have already - but a short intro one.