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Here is a link where you can get a manual for your specific Samsung laptop.http://www.samsung.com/levant/support/download/supportDownloadMain.do#
Honestly, there isn’t really a need for a step-by-step guide with modern versions of Windows. It isn’t like the old days when you needed to be familiar with DOS to make use of a PC. However, here is a link to Microsoft’s guide for new Windows users. It should take you through the basics, and you can always ask specific questions here if you run into a problem - there is usually someone with an answer, or they will at least point you in the right direction.
Windows 8 comes with Windows Defender, so you already have a basic level of protection against malware/viruses right out of the box. If you want, you can always install third-party antivirus software like Avast or AVG.