My side jobs come about through word of mouth. Pricing for one offs can be tricky. Material, time, equipment are a given but then degree of difficulty comes in there somewhere. Just because you can doesn't mean you should on some jobs. I always start by saying it could cost as much as ...... If I come I under the bid they are happy. That also gives me an opportunity to bid high if it is a job I don't really want. Allotting time for jobs can be tricky too, you still have a real life of work and family.