The best working spells are the ones you make yourself.
On this site there are many posts that hold grand information that explains how to make your own spell.
If you are a beginner in Magick learn your basics before you do anything.
The basics on how to make a spell are located here at
Also if you do not know your basics here are some excellent posts to enlighten you.
Think of the basics as the foundation of a house. In order for a house to stand or even be built a strong foundation is needed. Also it is more than just reading the basics, you must practice them as well.