Hi, and welcome to basenotes!
1. I can't answer this because I am not a fan of florals. I enjoy a rose note incorperated with certain scents but that is about the extent to what I care for in the floral world.
2. There are kits you can get. I'm pretty sure you can get pure oils of single notes to compare certain confusing notes. I just use what I have smelled to figure it out. I've smelled so many and have read so many scent pyramids. I just figure it out eventually. There are many notes that I don't pick up on or overlook but I'm getting better with time. It's very difficult. Some people here can't even figure out many common notes because of poor olfactory senses. It's semi luck and lots of practice.
3. No idea what you might be looking for. LL seems like something you'd like but if you don't then I'm not sure I can offer suggestions.
Welcome, once again...