Product chooser website form

Hey I’m wanting to create a questionnaire/survey on my website that asks the user various questions with the end results being one of the products that I offer. I really only need something basic at the moment as It is just to offer web design packages which I only have a few to choose from. If there is existing tutorials that would be great, but I would also be keen to look for existing software that can do this. Preferably in PHP. Thanks.