Getting job on deck

Hi can anybody tell me how I would go about getting a job on deck with no prior sea time? I am taking a deck familiarization course this week which I was going to use to help apply for msc OSAP but I had already applied so I have to call to see if I can reapply but if fails I would like to know my other options of actually getting a job or companies that would give me a chance? I have worked on a ship before.