First of all, I'm really new to maya, so my question might be dumb, but I've been searching the internet for hours now to solve a (seemingly simple) issue, hope you can help me before I go crazy

I'm trying to build a city scene from some downloaded building templates with multiple texture files that are parts of the building (e.g. windows, doors, brick wall, etc), but when I apply the texture (from file) it's a complete mess. What am I doing wrong, can someone help me? Attached is a picture, please don't laugh Many thanks!