Hi Kittywoo
A young pup gets bored easily, and I think a lot of behaviour is because of this. They also need lots of exercise, short bursts regularly.
Been there and got the t-shirt with mine - I could go on for ages about the damage she did when she was a pup - walls, carpet, chairs, wallpaper, brought the flowerbed into the kitchen, etc. In desperation, I took her to a dog psychologist , and he taught me to teach her to behave to commands - sit, down to floor, shake hands, etc. - all rewarded. I also bought a Kong - the thing you put food inside and the dog has to get out, but found it got mucky and smelly.
What I then did, and what she still loves, was put some small 'marrow' biscuits (supermarket - I let her smell them and see me doing it ), inside a clean plastic drinks or milk bottle and screw the top on - she had to get them out and this kept her occupied for ages, throwing it up in the air, biting it etc. The 'biscuits are just big enough to be a challenge for her to get out of the bottle. I had a 'den'' for her - somewhere she could always take the 'prey' she had caught - in fact, it was the rug in the hall.
She's over eight now, and still loves this.
The best advice the dog psychologist gave me was 'Hang in there - she'll be a great dog'.