You need an application that will digitize your drawings. There are applications that will auto fill artwork, but the results are too blocky looking for me. One that I've seen is from Buzz Tools.
Good digitizers hand place each and every stitch, resulting in subtly shaded designs. I looked into learning this art but the time it would take to learn the software, let alone the hours and hours needed to create a design were daunting.
The auto fill apps are hundreds of dollars, the better digitizing tools can run thousands. For that much money, I'd rather just buy my professionally digitized designs! My favorite site is:
http://www.emblibrary.com/EL/default.aspx
Just my opinion...