I have a 16 week old mini dachshund. Can anyone help?

1 3 and 5 are all training issues although 5 may be separation anxiety that cannot be completely trained out of him. 4. all dogs eat grass to help make them puke and settle their stomachs when they are upset. 2. he has lots of energy and just needs to be exercised and played with until he is plum tuckered out, he needs this every single day.