It sounds like you want to be able to use the Maps feature Turn by Turn Navigation. The following page will show you how to use it, named:
Get driving directions.
Tap the blue Quick Route button to the left of the location name to get turn-by-turn driving directions.
If more than one route is available, tap the one you prefer, then tap Start to hear turn-by-turn directions.
* Turn-by-turn navigation is available only on iPhone 4s or later and iPad 2 or later with cellular data capability.
From: iOS: Using Maps
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All the very best,
I believe that turn by turn navigation with voice is only supported on the iPhone 4S and higher.
Yes, that is correct. See this support document. http://support.apple.com/kb/HT5429
Message was edited by: ChrisJ4203