I'm adopting an adult rescue dog and overwhelmed by the aisles and aisles of shopping for dogs. Aside from the initial starter kit (bowls, dog bed. etc), how often should I be buying and giving the dog treats, dental sticks, toys etc.? Do I NEED dog toothpaste? Should I buy the 'safe stick' things or just chuck them a real wooden stick from the ground? Do I need a harness or a slip lead? It's a minefield! (first time dog owner) thank you!