Even though learning iOs as best as you can will probably prove not to be enough in the long term (at least not if you want to get serious about it: mobile developing is a pretty fast moving target...), there are still a couple of things you can do to leverage the system you own:
Read the programming guides by Apple
Even though both Apple and Google have the annoying habit of replacing the old documentation with the new one without leaving traces of the previous revisions, you can still sift it and separate what's relevant only for the latest versions of iOs and what still applies for Xcode 3.2.6.
For instance the "View Controller Programming Guide":
has a lot of stuff about Storyboards you can't use, but the basics of VC programming are still there.
It approach will require you a lot of effort, and long sessions of trial and error, but you will definitely find all the info you need.
Search internet for old tutorials
Even though Apple likes to wipe out it's own history, doesn't mean most blogger and contributors in internet will.
Google has a feature that allows you to search a page created between two dates of your choice: use it to find tutorials, guides and code created in the time interval when your version of XCode was on the market.