Your forearms should be perpindicular to the ground i.e vertical. Use a shoulder width grip. Some people have there hands together but this puts a lot of stress on the wrists.
__________________ Bodybuiding isn't just to look good for the summer, it's life long dedication, drive, commitment & heart...there's no such thing as a retired bbder - me
you can do it with your hands together... but I've always been taught to find the center of the bar and do a thumbs length in either direction, takes so much stress off of the wrists