Mag, how long have you been practicing the craft? It is suggested to work on the basics prior to spell casting. Some of the spells on this site just don't work. It would probably help you to write your own spells starting out.
you have to really will it too work; depending on the spell(s) the correspondence may not be strong enough on its own so you have to personally make up for the lack of connecting energy with will power. Try it and if that's not working then at least it no fault of your own.
Amora is right. you cant expect a spell to work automatically. Certain spells work in specific times. Just relax, i will take some time to work, especially if you are a beginner like me. Patience is what you need.