I began my assembly coding using TASM (Turbo Assembler) and made a small OpenGL game by studying the assembly code for the tutorials at nehe.gamedev.net.
But I will recommend you to begin by looking into MASM, which is Microsofts assemblator. There are a lot of sample code out there on the net and it is also pretty simple to set it up in Visual Studio which is very hand when debugging your application.
Check this link. It is great!
http://www.kipirvine.com/asm/gettingStarted/index.htm
/Klarre