Integrating GPS for my web site

I'm interested how to integrate GPS modules (I don't know what kind of modules they are), for my website, so that customers could see the location of product. I have to create application, where will be possible to register this modules by managers, and by webpage customers will be able to see the location of this modules. Which fields will do I need, what is required minimum to get GPS information from something, and what tools can I use? I'm a bit new, and will not do this alone, I just want to learn as much as possible until the job starts. Will be glad if you link some internet materials also. I'm looking for them in google, but not sure if doing it in right way.