Spells and spell craft are just one type of magic and this kind is very personal as it harnesses and releases your inner personal power and energy. It is just the same as a prayer. You want something to happen and therefore you are thinking with intent.
You will see on in books literally thousands and thousands of spells for one thing or another but the spells are always the ones you write yourself (or at least adapt in some way!).
A traditional witch practises magic everyday, casting spells is just ‘something we do’. Just like Christians would ‘pray’ or children ‘make a wish’, these are just the same ideas with different names. We all, no matter what you call it, want something to happen. Because we do not follow any dogma or rede (unlike Wiccans for example) we will do whatever we feel is needed for any particular situation and take responsibility for our own actions. A spell is not bad or good (or black or white), it is the caster who wields the intent and therefore the caster who has the power to sway the spell one way or another.
However, you need to think about what you want to get from the spell. Remember the old saying “be careful what you wish for”. This is very true for spells. Maybe you have written a spell to banish debt or to bring money your way. Have you thought about how that money may come to you? Someone may die and leave you an inheritance. You have to really think about what you want, how you could get it and if you really need what you are asking for at all.
Spells can be as long or as short as you want or need them to be. They can be flamboyant or simple, easy to do or require a full ritual. It is up to you, there are no hard and fast rules to witchcraft, you do what you need to do at any given time. As I said before, magic is a part of you, you can decide how and when you use it.
The one thing spells should have, and should also be given, the same with magic, is respect. Don’t be fooled in thinking that all you are doing is making a flippant request. Spells work, magic happens. Be careful what you wish for….