My opinion is that a spell that you create works better for you than someone elses. Not saying that theirs wont work. But one that you create has your energy, your emotion ect. Also I have taking someone else's at times and tailored it to fit my situation which also works. When you create your own spell it also gives you a feeling of accomplishment. It builds your self confidence which also will help when you cast the spell. Just keep it simple to start with and have fun with it.
Love and Light,