Hi
I have had the same problem a few years ago, as I am an old engineer and I didn't use CAD software and I didn't familiar with those. So, I start with AUTO-CAD but after some days I found solidworks software which is very simpler. I suggest you go through it. It has a very good simulation and you can use it easily. If you have any questions or ambiguity you can find your answers on the internet or ask me in this forum.
Good luck.
Gholam.