yes, one can do a love spell for another, though it does get more challenging when you don't know the person, or can't direct the energy properly. while i don't cast for others, those i talk to who do normally ask for a picture of you and the other person along with where you live roughly [say, new york city] your age, full names and zodiac signs. some add or remove some points but those two are the most common ones.
i feel you should cast for yourself though, your desire's stronger, there are plenty of spells on the site to help, especially love spells. since the moon is waxing right now, it's the perfect time, hedge your bets by calculating it down to the right day and time if you want to go that far.