Welcome to the forums!
Most of your questions have probably been answered in threads. Click on the blue bar near the top of the pack on the "Search"...and do some looking.
Your puppy can start Puppy Kindergarten soon...around here they can start when they've had their second set of vaccinations. Start looking for classes now...and avoid the Petsmart big box stores for classes. An obedience club or training club is the best.
Puppy not eating from stainless steel bowl probably because it's on the bare floor? Put a towel under it..so it does not vibrate or move around. Take the plastic bowl out of the crate, so then he has no choice. He will eat when he is hungry from any type of bowl.
For barking...just re-direct. Get his attention on something else...get a squeeky toy and start playing with it, call him over and start doing something with him. When he is quiet praise. Classes will help you learn how to teach him things.
As for walking, he should be good to go now. Make sure they are short walks, and in safe places. Don't take him to a park or places there is dog feces or urine. He should be out and about socializing , meeting new people and see different places. He should be meeting other well behaved, vaccinated dogs too.
How many hours is he in the crate? He should not be crated for more then 3-4 hours at a time....even at night he should be going out for a potty break.
Gina