Assuming you want to store your results on a back end web server with a DB then you would first need to write some web services. I personally would suggest a combination of PHP and MySQL as they're both open source and relatively easy to get to grips with. I also recommend you use JSON as your data interchange format as it provides a human readable structure without the complexity of XML.
Once you have a functioning back end you would need to build an app with the appropriate data fields that you want in either one or multiple views. Personally I would put all of your questions into an array and then cycle through them changing the input controls if necessary. You can then add your answers to an NSMutableArray.
Once you have your complete answer set in your NSMutableArray you can serialise it to JSON and transmit it off to your web service.
There are many guides for getting started with JSON on iOS available, I would suggest you take a look at this one.