If all you want to do is create your own drawings of parts, you don't need a lot of experience or tools, as long as you can print at true 1:1 on a laser printer or etc. to check your work. Also need to have a caliper, machinist's protractor, accurate scale, and a lot of patience/time on your hands.
I assume you are using AutoCAD or something like it. All you really need to know to accomplish what you are asking about could be contained in a couple page pamphlet or a long email. Very basic commands:
Line, Trim, Fillet (with and without the radius modifier), Object Snap, Circle (with the Radius or Diameter modifers), Erase, Construction Line (with the Angle modifier), Rotate (with a reference), Object UCS, World UCS, Arc, and Offset can make just about anything you would want for a 2.3t, unless you are trying for advanced 3D or to draw the whole engine or something. Learn those commands and how to dimension parts, and then go to town. Print things out 1:1 and check them against your parts, tweaking things until the fit is correct.
Even when I do manual high level CNC machine programming at work, the Z axis is controlled through the assignment of specific layer names that correspond to a unique cutting tool and the distance it runs above the bed of the machine. The X and Y axis are controlled from a polyline in an AutoCAD drawing that has been exported to dxf and sent downstairs to the router.
Seriously, this isn't rocket science. Pick up a For Dummies if you have to, I am self-taught via that method with some on-the-job training on the CNC end of things.
Brian
Welcome Visitor! Please take a few seconds and 
I don't expect any PRO help just some quick numbers or simple CAD/CAM stuff. Might even be able to send you what you draw if nothing else.
