The critical thing is to get a pipeline of folks you know that send work your way. So rarely idle. That was done by working 15 years in the field in a variety of companies. I keep in contact with many old colleagues and remind them I've got bandwidth.
I never made more money than I do contracting now. I've never had to 'chase down money' - never had a bad check, never been stiffed. Had some late checks for sure. Probably due to the quality of my contacts.