So here's the lowdown. A friend of mine's dog gave birth to puppies about a month or so ago. They were about to move, but couldn't take the puppies along, so they had to leave them behind. I took one of the puppies (the cutuest one of course

), but the puppy is only about 4-6 weeks.
What do i do? I'm planning to take him to the Vet within the next few days for a checkup. What do i feed him? how many times a day? how much do i feed him?
right now, I'm giving him milk with some water added to it, and before serving it to him, i warm it up in the microwave a little so that it isn't so cold. That's been his diet for the past 6hrs. I just got him today. He's sleeping right now in a somewhat large enough box for him so that he could move around. I put newspapers on the bottom of the box. Since i've put the milk in his box, he's been peeing like crazy. 3-4 times he's peed already in like these last 4hrs. he hasn't pooped yet. He's got his k9's..his other teeth are growing still..some are out.. he likes to chew on my finger with his gummy part of his mouth. He seems to be healthy... warm tongue, active when he plays with me, he likes to sleep, twitches when he sleeps..he's got a big tummy.., from what i read, those are signs of a healthy pup.
If you could give me any important information I should know, or any good websites that provide important information for a new pup owner like myself, i would surely appreciate it. I know it's not too good to be taking care of a 4-6 week old puppy... but, someone has to do it, its mom isnt here anymore. Thanks in advance.