Experience I've been in the 3D/2D CAD industry for over 10 yrs. & also had the opportunity/exposure to work with several mainstream design platforms including Helix Design Systems to Land Desktop.
can u guide me where i will get the free tutorials on the Internet for autolisp
Answer I'd suggest investing on buying an autolisp book first. Trust me this'll come in handy. I've used "Autolisp Programming: Principles and Techniques" over the years as my ref. book - it covers your basics, commands used, & the scripting logics. It was published sometime back in '98, so it lacks the Visual Lisp functions, however this book is very informative & easy to follow instructions.
Internet sources that I would extremely recommend are:
new.cadalyst.com/code & www.afralisp.net
Both sites contains a all necessary codes & tutorials you'll need. Hope this points you to the right direction, Let me know how it goes!