Create a search system on drupal 7 site

Hi there!

I have to create a system hotel booking search for a project on drupal.

The interface looks like this

http://s14.postimage.org/wnj0yrkap/Untitled.png

I can actually create a content type for searching but them problem is how to do a search for the items the user want. All information is stored in database. Maybe I should figure out how database is structured in drupal 7 and how to work with that. How database is related to every "hotel" node, that I create?

Is there something wrong with my thinking?

Could someone get me started with this issue?

Any help would be appreciated!