If you are an atheist, it will be difficult to progress past the basic level. Black magic has nothing to prove to you. It is a well established, Well documented, and extremely popular tradition, which expands back Thousands of centuries. Black magic has everything to do with contacting spiritual entities of all types. If this is a challenge for you to accept, Stop now and find something else to practice.
For everyone else, try not to jump straight into demonology or other advanced areas until you build the foundation as suggested. It is mainly suggested you follow this path so your knowledge can build itself, and by the time you reach advanced practices you have little fear as you know the knowledge behind the words, and you had the skills to handle yourself in most situations.
My advise to every one is cast safe spells always. Another important thing I will discuss is that if you want to be successful in spell casting then always try to be positive and confident about yourself. For all this first train your subconscious mind in such a way that it becomes positive. Remember if your subconscious mind is positive then no power in this world can stop you from being successful. As we all know that we only use 6-7 percent of our mind, and the rest is under the control of our subconscious mind power. And if you can control that then success has to be with you and no one can stop you. For all this it is important that you may also learn little meditation. If you do proper meditation every day then many times even you can open your third eye. And with meditation you can activate your subconscious mind so that it will be positive and then all the spells that you will cast will give you 100 percent results.
Now you may wonder as how does Magic Spells work??, now as we all know that our universe is very vast and there are many positive and strong energies in the universe. When we cast spells, then we absorb positive energies from the universe and once this is done then our positive energies join with the energies from the universe and they work together as a positive force doing wonders for us and giving us positive results.