Welcome to YT! It's good that you have found this site, and please do as nanahas3 suggests; your puppy is VERY young to be on his own, and the next few weeks are crucial to his well-being, health, and even survival. If you take care of him, and provide for his needs, including food, shelter, play, and healthcare, he will be a happy puppy, and should reward you with years of fun and companionship, and unconditional love.
