Hi Bart (I'm new here)
I normally put no definite pricing information online - it locks you into a certain pricing model that's not always represenative of how much work goes into each project.
Usually I've found that word of mouth is much more effective than any online price guide/advertising - I quote by the project once I've sat down and had a chat/spoken on the phone with whoever wants to hire me. Ideally I try and get a look at the stems/audio I'll be working with before I quote too. It leaves a lot of room to take on quicker/easier jobs (clients with lower expectations for a demo/first EP) and bigger clients who are more serious about their work (and willing to spend the money for a full mix/master job).
As for usual questions, normally along the lines of 'can you do this', and my personal favourite stupid question 'how good will it sound'...