The best kind of love spells are more like little crush spells. You have to do the work: talk to the person you are interested in, ask them to meet up with you, etc. The spell is mostly for you. It cleanses the energy around your relationship with this person and can strengthen the connection you have with them, but it all starts with a connection.
The term "love spell" is very vague because we don't know what kind of love you want and there are all different kinds of spells that fit under that category: obsession, lust, love, crush. There can also be a lot of controversy that come with some of these...
Mostly you have to kind of experiment with them until you feel you have found one that works for you. (I always find spells work better if I have created them myself or put a personal spin on it so it better fits my casting style).
Best of luck to you