So sorry to hear about your poor boy. From what I've read, blind dogs seem to adapt to this situation far more easily than humans do, although it is of course terribly distressing for you. I'm sure you are fully aware that not moving furniture, changing where his bed or food/water bowls are located, and a stair gate to prevent any accidents are all fairly obvious things to do. You can also purchase a 'Muffin's Halo guide' a large rigid circle that fits above the dog's head and kept in position by the harness it is attached to that helps prevent them bumping into things, but a lot of dogs seem to manage perfectly well in their known environments without one. There are also quite a lot of support groups for owners of blind dogs on Facebook that you may find of interest to you.
The young pugs who lose their eyesight adapt very quickly having better hearing and sense of smell than a senior, but give him time and you'll soon be in awe of just how well he can manage.
Most pugs seem to adapt fairly well, though some take a bit longer than others to adjust. I almost think it's harder on the humans... I know that as my 15.5 year old girl pug (Nilla) has lost more of her vision and my nearly 13 year old boy pug (Wonka) has lost much of his hearing, it seems that I am the one having trouble coping with the changes! They both seem to be adjusting and making do, but it's sad and upsetting to me. So, while I don't really have much advice, I do know what it feels like and offer some kind thoughts and some positive vibe for you and your boy.
Mom to Miss Jelly Bean "Beanie" Licorice Pug
Forever in our hearts: Miss Nilla Sassafras Pug August 17, 2002 to April 19, 2018
And my Heart-Dog... Wonka the Dancing Pug, CGC, W-FD, W-TFD.
Februrary 11, 2005 to May 10, 2020. Miss you, sweet boy!