Jigsaw Block Help

I want to make a procedurally generated dungeon using jigsaw blocks, but its my first time and I have no idea what to do,  I've looked at some tutorials but none of them work, I just spawn the starting point of the structure and it doesnt connect.

https://imgur.com/a/6dMNAMF

I can provide any images or data if you need to help.

Thanks!