Harem Hotel has been designed to be as simple as possible to play, and I try to make it even easier with quality of life updates where I can. As it says in the very beginning, check for story events at character's doors. That's pretty much all there is to it. Sometimes events will be elsewhere, but you will be made aware of it, and if you can't do a story event the game will also tell you exactly what you need to do.
I'm not sure where any confusion could be coming from, have you tried playing without the walkthrough? What are you having issues with specifically?
If you would like the raw required stats, you can check the wiki >
You must be registered to see the links
but even a wiki shouldn't be necessary to play at all.