You guys aren't helping him by spelling out beliefs to him/her, when you could provide for what is asked. Advice is nice, buts nicer when you respond correctly. And be more fluent in your questions, please. You'll find that most here don't tolerate those uneducated in grammar.
Spoon-feeding is distasteful. I recommend you read through all the FAQs displayed; skip some here and there. There will be questions similar to yours, and the answers will provide you a better basis. After your questions are answered, move to articles so you understand the nature of magick. I recommend you read Herbs aswell, for they can be potent in a spell. Don't be afraid to change a spell. Members have made these spells that are posted. Don't be afraid to even make your own. Keep it in a Spellbook. Whether you want a Book of Shadows, a book that collects all spells that will be handy to you, or a simple notebook that will give you tips along with specific spells and purposes that you dedicate yourself to, you must learn with it. And keep it intact, for there is always answers to be found.
Lastly, once you're grasp is stronger, take a gander at the Spells section, and look for curses corresponding with that category you wish for. Feel free to type in "nightmare spell" or "nightmare curse" in the search box, at the very top right of this website.
~May the Visions of Isis guide you