Finding locations can be very frustrating, but google is your best friend. Try to find out the history of the building you’re looking for and go from there. Most locations go by their alias so try to find the real name. If you know what the location was used for and you know the city, you could try to search on former hospital of ‘’city’’ or former university of ‘’city’’. If you're lucky a news article or something about that place pops up.
Urban exploration forums
You can join urban exploration forums and get to know the people in the community. Introduce yourself and if you have pictures of places you’ve visited, post them. Sometimes other urban explorers are willing to trade locations or you could even go on trips together. It’s a great way to meet other explorers.
Pictures and blogposts
You could also try to find any clues or information in the photos or blogposts you see online. Maybe you can see a store outside the window or something noteable in the erea you can search for on google. I once was watching an urbex video and found a location by looking up the adress of a store that was in the same street of the building I was looking for. And whenever you are on the road keep your eyes peeled, we’ve found some great places while driving to other locations. After a while you get the hang of searching for locations and it will be easier.
Don’t expect to find locations easily. I sometimes spend days or even weeks on finding one location. If you get stuck take a break and search further the next day or week with a clear mind.