I'm hoping somebody can help me or direct me to someone who can help me...

I don't know what is wrong with me, but I just want to put some lights on my scenery and I cannot understand any of it.  The terminology is like a foreign lang. I also have some little HO scale cars with headlights that I'd like to put on there.  I am wondering if anyone could double dumb it down for me and help me figure out how to do this w/o spending a fortune.  I haven't gotten any lights yet because I can't fig out what else I need to get.  I do not want anything fancy, just the ability to turn all of them on and off and the least confusing way to connect them to power.  My layout is HO scale, it is a simple oval and it has a country road through it with a bridge going over some water.  There is a giant waterfall and some palm trees and this is my first train so forgive me for being so ignorant but I am totally struggling with this light thing.  I am close to using a string of battery operated mini led lights for fairy *** and rig it somehow. hahahahahah jk help me pleaseeeee Tongue Tied