To perform NDE, you'll need it in a QAM, a written practice that typically has to be in line with the recommendations of ASNT SNT-TC-1A, under that written practice the requirements for Level I and II should be stated per tc1a or cp 189 depending on which standard they go to. You can contract the level III duties to an outside agency but you will still have to work under a level II until you have the required hours.
It's not something your going to be able to do overnight, and will likely cost some money. You may want to evaulate the cost of contracting the work outright, vs. creating your own program.