the marshall jmp 1 is a "pre-amp." it's a component unit, meaning a part of a rack system. it's basically a unit that produces the clean and distorted sounds that you wish to use (like a distortion pedal, but way more complicated.) it does not amplify your sound, you need something called a power amp that you would plug the jmp 1 into, then you would also need speakers that the power amp would plug into. It's all complicated at first. I own a jmp-1 and am fairly new to the idea of rack gear, it's cool stuff expensive though.

(your guitar plugs into jmp-1, jmp1 plugs into amplifier, amplifier plugs into speakers)