The process of finding a part time job is the same as looking for a full time job. Please refer to the questions above: ‘Where do I look for jobs?’ and ‘How do I find a job that is local to me?’
Please, however, please keep in mind that finding a part time job would usually take longer than finding a full time employment, especially if you have particular availability or visa constrains the practice needs to accommodate. In other words: the more flexible you are, the easier it will be to find work.