Dual monitors?

I would love to have a dual monitor set up for playing my video games but it is not something I have been able to do at least as of yet.

I do have somewhat of a duel monitor set up for my laptop using a HDMI cable into my TV which helps me multi-task and I guess I could also use that for gaming if I wanted to.
 
My dream have always to have dual monitors at home. Just set them up for my gaming, posting, tweeting or writing. My big brother have a dual monitors and I have always wanted to have mine too. I just need to save more and more money to get them for myself.