how to bake the light like this?

Im trying bake the light clarity of the light as you see on the wall on this renderization, how can I do that, I need to create a small store and it needs a lot of lights so I want to bake the result instead of put all the lights!
Can The lights affect the AO?

See this guide:
http://www.guildofwriters.com/wiki/Lightmapping

I hope it helps

thanks for the tutorial