I'm a beginner and I want to install SharePoint. I have Windows 7 and Microsoft Office 2013.
What I should do? Do I need Windows Server to install it?
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first , you need to decide on which version that you would like to have and then follow the msdn articles for latest 2013 version for hardware and software requirements.
you can also choose the version in the same article to get the understanding on pre-requisites.
I would suggest you to install Virtual Machine like VMWare WorkStation and then you have to install Microsoft windows server and Microsoft SQL after that SharePoint 2013.
Personally I referred this blog when I was installing my SharePoint. You can do the same and make sure you are meeting the system requirements for SP2013.
How to install it, please this check blog http://www.jeanpaulva.com/index.php/2014/01/23/installing-sharepoint-2013-on-virtual-machine/
You can install the Sharepoint on windows 7, This is not supported but developer usually use for their own testing and learning. check this Install SharePoint 2013 on Windows 7/8/8.1
I would highly recommend to install the VM on your windows 7 and install the SharePoint on it. You need the SQL server, Windows Server for the SharePoint, check the complete list of pre-reuisite over here.