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I would suggest that you purchase a high quality dry food in small bites that you can leave out all the time. These little dogs usually won't eat it unless it's in small bites. Iams is great and I like eukanuba. Just be sure that it's small bites. Leave a few tablespoons out for him all the time and "free feed." He might only eat a few bites each day but it's there if he wants it. I would then offer him a quality canned food twice a day. Leave it out for 30 minutes and then take it back up. If he does not eat it, start again with the next feeding. Don't leave it out for more than 30 minutes.
With these little dogs, you can never give them treats or table food until they get a little older. If you ever give it, they will wait for it and won't eat until they get it.
These little dogs will win out because of the low blood sugar problems if you let them. You can somewhat combat this by giving the dog neutracal a few times a day. It's a paste that is loaded with vitamins and keep his blood sugar up.
As he gets a little older, you can be a little more free with his food. You just need to get him through this rough spot.
I hope this helps!
If you still have specific questions, feel free to ask.