Great advice here from everyone. There is a free mini class on Craftsy for free. It may give you some hints on placement etc.
Please remember to write down your settings. I recently "pull out" my embroidery machine that has not been used for some time. I spent two days doing practice pieces and had it perfected. Yesterday I hooped the area of the quilt that I wanted to embroider and it embroidered beautifully, BUT I had chosen the wrong image. It came out as a rectangle and not a perfect square. As it was on point I just could not leave it, so I spent all day picking it out. I should have made explicit notes on which image and stitch length, etc. as I had made a number of changes to the original and saved various versions. Lesson learned I sure won't do that again. Good luck. Even with this mishap I will be doing more embroidery on my quilts in the future.