I'm going to start out the spell creating series with the types of spells most commonly done by us magick users: common spellcraft done by magic users. You have a need, you work up a spell, you do it, it's over.
These types of spells tend to rely heavily on use of correspondences and symbolism, and moving energy around thru' correspondences to the charged symbols. This is the stuff of spell kits: they provide incense/colored candles/oils/herbs that have some correspondence to the job to be done, and some words to be said. The buyer charges the symbol (often by anointing the candle with the oil or carving a word or two into the candle), then recites the words of the spell as a means of directing energy.
This is stuff you can also easily get together yourself. Lists of basic correspondences are all over the web, there are books full of them, etc. What color? You can look at a list of chakras and use the colors of them that relate to the need. Oil? Here I'd look up what COMMON herbs relate to the need, and add that to an unscented cooking oil - corn or vegetable (Okay, that's really soy) or peanut oil. Incense? On the whole, I'd say you can't go wrong with Jasmine, but that's because for ME all magic that I do pretty much happens in the Astral, and that corresponds to the Kabalistic sphere of Yesod. Your mileage may vary, of course!
Doing the research for correspondences brings two different things to your magical world. First - it helps increase your knowledge. If you've been reading this blog for any amount of time, you know I'm all for that! The more you have internalized the better your magic will be.
Second, doing the research work starts the magical work. It starts building your intent, it starts building the energy, it brings coherence to the magic. You don't get that from a spell kit - the kit may have all the correspondences down cold, but they are not part of YOUR energy or intent. Doing the work yourself makes them YOURS.
Now, about the 'words' to a spell: they CAN be very powerful. Not the words themselves, but putting your intent out in sound to the universe. So don't be dependent on the words of others, unless you're doing some magic that requires some really serious invocation of some divinity. And that's pretty rare in spellwork - more common in theurgy than in thaumaturgy. So write what you Will. And, really, try to memorize it JUST because it hard to feel/look powerful reading from a cheat sheet! That's why rhyme comes in - spells are just easier to memorize if the words have rhyme and meter!
I'll cover 'how to magically charge an object' another time, this is enough of a blog post for one day.