I want to update Mac OS X 10.5.8 to Lion.

I want to update Mac OS X 10.5.8 to Lion.
I ask to help and it is detailed, step by step to explain that it is necessary to do!
Thanks.

Instead of going to Lion which is no longer available I'd recommend going to Mountain Lion. Apple explains the minimum system requirements in:
General Requirements
OS X v10.6.8 or later
2GB of memory (4GB or more recommended)
8GB of available space
Some features require an Apple ID; terms apply.
Some features require a compatible Internet service provider; fees may apply.
Supported
Models
iMac (Mid 2007 or newer)
MacBook (Late 2008 Aluminum, or Early 2009 or newer)
MacBook Pro (Mid/Late 2007 or newer)
Xserve (Early 2009)
MacBook Air (Late 2008 or newer)
Mac mini (Early 2009 or newer)
Mac Pro (Early 2008 or newer)
If your system can be upgraded, first backup using Time Machine or create a bootable clone using SuperDuper or Carbon Copy Cloner. Then call the online Apple Store and purchase a license of Snow Leopard (no longer availble unless you call Apple!!!!) then follow the instructions that come with the DVD to upgrade to Snow Leopard. Next upgrade to the most current release of SL which is 10.6.8 by clicking 10.6.8 Update Combo and following the on-screen instructions. After the update run Software Update to ensure all other apps are up-to-date and follow all the suggested recommendations! Next open the Mac App Store and purchase Mt. Lion and follow the on-screen instructions. VERY VERY simple  if you follow these instructions.

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