He sounds very bored...and he is a beagle, so he will get bored very easily. He might also be teething. Does he have toys? A variety of toys is always good for a puppy. Don't leave them all out all the time. One or two at a time is good, so he won't get bored. Try a kong, and put some peanut butter or kibble in it. Does he get walked or played with? What about training time..short sessions of working on sit, down, come, etc.

For him running away...he needs a fenced in yard, a tie out, or you to walk him on a leash. Some dogs just cannot be let off leash. And the aggressive behavior-do not play aggressively with him whatsoever. Try and keep a spray bottle near by and give him a squirt, with a firm NO. The "leave it" command is very useful for this also.

Good luck!