How do I find places to explore.

It really depends on where you are! I will try to give a few things that helped me and hopefully this helps!
I would look on google maps and just kinda grind out an hour or so looking around in random places in the city. or just google "abandoned places (city name)"
You can always ask around especially some of the older people in your region because they may know of a building that used to be active but isnt.
Try a few historical markers if there are a few in the city!

I know me and my friends knew of only one singular place in our city but because we drove there we saw other abandoned places on the way! so sometimes even driving in areas you arent normally helps!

Usually its best to go outside but for me atleast, when i couldnt find anything, i js hopped on google and searched for local buisnesses that shut down, that way i actually discovered alot of spots. If that doesnt work you could try this website here: Urbexology.com its a map of every abandoned loc around the world, but if you live in a small area you most likely wont find anything. If you have other friends that urbex you could ask them too.