Jigsaw puzzle

Hi all I am looking at either doing a jigsaw puzzle on Corel draw x7 or even downloading one to use but I cannot find out how to do either, I have tried doing a quick trace on some I have found but when I cut them out it don't look very good at all, some pieces are either bigger than others or the outline (lines) are to thick and just keeps cutting round 2 or 3 times.

Does anybody know how I can avoid this or even tell me where I can find a good quality image I can work with.? I am cutting it out on a Lazer machine and using MDF. Thanks in advance if you can help me out.