Hi there! If you have any specific questions on what to do, you can ask here and someone will usually help. I'll help if I can - I've romanced everybody by now, lol.
The biggest tip that helped me move guys from friends to crush and lovers is to date them to raise their heart level, but visit them at every place during the week and - crucially - at every location. There's lots of scenes that won't unlock until you meet some criteria of heart level, but the scenes are location locked and only go in order. So, for example, if your next scene with Toru is at the park but you're only visiting him at another location, your relationship will never progress.
For more general help, here's a fanmade guide with help with auditions and things:
https://docs.google.com/document/d/1P6iYaiVrfa9TLpGbv7B51TocGv3zhcPUK89HzrbKyIw/...