Alright, so despite the helpful opinions previously shared, I do believe that Love Spells do work:)
A love spell will work for a specific person, however, personally I find that wrong and you will find the Karma will bring back to you what you have done to others 3 x.
Instead, I think you are smart in wondering if you can conduct a love spell for someone you have not met before, because that would, in my opinion, be the best thing to do. Do a spell to open yourself up to love, and to prepare you heart for the soul mate of your dreams, or even to draw that person to you (without choosing a person for yourself).
This could even be detrimental to you, because the Divine knows who you are meant to be with and you choosing for yourself is almost like an insult to your Divine plan. So do a spell that will draw the love of your life to you, or even a meditation/dream spell to discover, perhaps, when you will meet this individual or what growth you must undergo in order for it to take place.
My BEST wishes to you and your dreams of love. Hang in there and be patient to any results that are to come. TRUST the Divine to bring to you what you have been waiting for. Because you will be shown something greater than you would have ever imagined.