The growth of the self development industry has moved people towards taking control of their own lives and this also relates to the world of magic and witchcraft. Spell casting would have been a controversial topic years ago, but it appears that many people are taking ownership of their personal development and connecting with their personal power.
Here is a very simple format for doing all rituals:
Create a serene environment in your own space where ever that may be and where you won't be disturbed. Visualise a circle of white light around you. Next, invite the four directions, or quarters, north, south, east and west. See them as earthy, fiery, airy and watery beings.
Then, a candle of intention should be lit and incense burned (frankincense is good). Now with the mood prepared, you are now ready to start your spell. See clearly what you want to create in your mind's eye. You can draw it as a symbol or picture on a small piece of paper. Don't worry if art isn't your thing! And now, what ever comes to you speak out loud, or whisper what you want to create. You can speak for seconds or a few minutes, there is no limit really. It's up to you.
When your speaking is finished, state "So mote it be" out loud. Roll up your paper containing your symbol or drawing. Using a flame proof surface - either a metal sink, hearth or cauldron for example, use your candle to burn it and meditate on its ash and smoke disappearing into the air.
It is now complete.
So, which rites to do?! It depends on you. There are many beginners books on magic but whatever life situation you can think of, a spell will exist for it. Life areas commonly covered are break up rituals to heal the pain, love and relationships, house and home, work and career, health and pets. Your own book of shadows spells will always be heartening to open when you feel the need to cast, as they are your own personal works.
Some people want to pay for someone else to cast which I always find amusing because they think they need an expert - you don't. Of course, get advice and instruction from the more practiced in the magical community, but you shouldn't need to pay someone to cast simple real magic spells for you. You can do them yourself for free. These will also be more powerful as you are the one with the desire for a particular outcome. Another person won't have this like you do.
Spellcraft that is to be avoided involves black magic and anything you feel is manipulative or evil, voodoo, curses, revenge and willing another to die. Dabbling in any form of darkness where harm is wished upon another is forbidden in the world of witchcraft. So, I hope this has helped to answer the question of how to cast spells and has provided a good basis of casting many more in the future.