A friend asked me a few days ago if I could maybe be interested in making their small company a website and accompanying CMS, because none of the out-of-the-box solutions seem to suit their needs. I agreed to think about it - at least let's see what the requirements are and so on, and see if I could and should do it or maybe redirect and point them to a better direction. Always help a friend in need is my motto. And to clarify, with these people I can be sure they're not considering this a friend favor (i.e. doing something for free, or for really cheap), but these people tend to be willing to pay relatively well.

But to the question: I've never done freelance work on this field - I have absolutely no idea how to evaluate the value of my work, e.g. how much should I ask? And what are the things I should take into account and think of differently versus being on full-time payroll in some company?