How can i connect the body to the hand? Im pretty new in Blender and this is one of my first modeled characters.I'm trying to figure out how to Connect body to hand, but I don´t know how.

The body and hand are both joined (and they have Mirror modifier added) but every time a try to connect them with Bridge Edge Loops it makes something horrible... see picture 2.
Like Duane Dibbley is saying you are having the hand on the wrong side.
Try to attach the hand on the other side or enable 'Adjust Edit Cage' in the Mirror modifier: