How can I use set up a tv and monitor to my desktop

I had my TV set up for 2 years but I decided I want to connect a monitor so u can have 2 screens.

I have an hp desktop setting it up with my toshiba tv was easy all I had to do was plug it in using a hdmi cable.i have an acer monster connecting it to my PC with vga . It is not receiving any signal

I just went in bios and turned on the vga output but then my tv wasn't connected Any more