1. Click Insert tab -> References panel -> Attach.
2. In the Select Image File dialog box, select a file name from the list or enter the name of the image file in the File Name box. Click Open.
3. In the Image dialog box, use one of the following methods to specify insertion point, scale, or rotation:
Select Specify On-Screen to use the pointing device to insert the image at the location, scale, or angle you want.
Clear Specify On-Screen and enter values under Insertion Point, Scale, or rotation.
To view the unit of measurement for the image, click Details.
4. Click OK.
try looking at youtube videos on how to draw with autocad, start with simple parts then move to more complex ones