Learn your basics, Study them intently so you may understand how spells work, how to enhance them, and help you feel more in control with them.
Google search and read up on
Spiritual uses of Herbs,
If you cannot find it related to the craft, add terms onto your search such as 'Magick, Witchcraft, Pagan, occult' etc.
Study until you memorize these.
If you cannot tell what phase you should cast a Wealth spell on, and with which color candle, you're not done studying.
Doe makes some excellent points. look into the moon phases and try clearing your mind, as well, learn to charge and ground energy properly. those are the three best solutions. if your spells still fail you can look into the other points, like the herbs and such. keep in mind though, what type of spell are you casting, since some spells aren't real and won't work no matter how experienced you are.
@ : xMakinax, you cannot become a mermaid. it's one of those spells i mentioned above that will not work. i'm sorry if i hurt your feelings, but we are human, we were born human, we live as humans, and will die human. magic cannot change scientific facts. magic is energy, we cast spells to help improve our lives. how is becoming a mermaid going to improve your life outside of not going to school? if you love mermaids so much, look into incorporating them into your craft.
@Nekoshema, you are right. All my thought is, if i should post here, i will quickly see someone that will help and teach me how to cast a spell,actually i cant specify, it will be great if i should learn any,which one do you want to teach me?