It might not be necessary to draw out the full number of parts in a sheet layout and might be better if you didn't try to guess their way of working.First of all,be aware that you are looking for very small parts and cutting all the way through the material will very likely lead to the part jumping around as the cut is completed,with likely damage to the edges.Some small holding tags may have to be left which you,or they, will need to clean off at a later stage.I would suggest you draw the parts using any program you have access to that can export a .dxf rather than a .dwg.The reason for this being that .dwg is an Autocad proprietary file type and from time to time they change the exact requirements so that an older CAD system won't read a newer .dwg.It helps their annual update sales if nothing else but .dxf usually works with anything.It helps enormously if the entities you draw are joined around the boundaries of any features that need cutting and while most CNC shops accepting customer files will check for this it does occupy a little time and the customer will end up paying.If you draw an example of each type of part you need and clearly state how many of each on the drawing the shop will have their own approach to leaving enough material around each part and allowing space for holding the workpiece in place.If your chosen shop is using vacuum hold down they will need a big enough workpiece to stay in place while the machining is carried out.You may need to discuss this with them and ask if you or they should do the nesting.