I'm not familiar with the resources in your are but will give you some ideas so you can research options in your area. If you can keep your dog in your home while looking for a new family to adopt it, that would be best and less stress on Animal Resuce groups in your area. I thought Craigslist had a seperate area for pet listings, that may be why your ad is pulled? Anyway, classifieds are good but you want to do a few things. Make sure to ask for an adoption fee. Even if you donate this money to a charity, this will help determine how serious someone is. Unfortunately puppies can be sought after by people using them as "pitbull bait" and /or resale sometimes to labs for research. If someone balks at a modest adoption fee, are they really going to have or use resources to take them to the vet and give them proper care? Tell any potential adopter know that there is someone interested ahead of them. This gives you an easier way to say NO if you have a bad feeling about someone. If you have that bad feeling, don't give your puppy to them. If this is something you can't take on, research rescue groups in your area. A local vet should have a listing as well as the animal shelter. If your dog is breed specific, check to see if there is a breed specific rescue in your area (lab rescue, beagle rescue, etc...) Some will even take or help facilitate adoptions for dogs that aren't full bred but are a mix of that breed. An example is, if your puppy is mostly Golden retriever but mixed with lab or shephard Golden Rescue might still help you. Tell everyone you know that you have a puppy available for adoption. It's all about getting the word out and doing the best job of marketing you can.
Last, I'll bring this up but take it with a grain of salt as I have no idea your exact situation, the temprement of your puppy etc. The first year of a puppies life IS pretty intense. BUT if you are able to make time to train, exercise, and work with your puppy the payoff is priceless. I understand what having a puppy is like and to be honest, don't know if I'd do it again. BUT, the BEST dog I ever had was a Golden Retriever. I had her as a pup (was single at the time) and was able to spend lots of time with her. She was a fairly easy pup but boy puppyhood is challenging. I'll tell you though, she was my snoopy! In my mind she was the best, smartest dog I EVER had (Air Bud, OH PLEASE, my dog coulda run circles around him ;-). Anyway, I would hate for you to miss having such a wonderful experience, not realizing that yes, puppyhood can be hard but the payoff is so great. All the best.