Dear all
5 Answers

I would start by following some tutorials on Youtube. Then, once you have some practice on small simple parts, and have used all of the tools a few times, you could then ask more specific questions if you get stuck on something.
You can find tutorials in the Youtube, just follow them...Then you will be an expert within a year..

dear friend, "YOU TUBE" is our best teacher, you gone through tutorial,if you have any daubts please let me know, or you can mail me your problem, i hope i will defiantly help you

https://www.lynda.com This is also good source to learn designing. But you need to have a account for that. I think it’s free for some universities.