Using Google maps for 'closest store' page

I’m wanting to find my way around google maps and using it to put together some basic applications.

I’m currently looking at building a basic app that would allow users to enter their post code/area code, and then get presented with a map showing the closest ‘stores’ in relation to that area.

Can someone please point me in the direction of a good tutorial that would run me through the basics of creating something like this?

Here’s an example of what I’m talking about: