1. Highlighters Card Scissors
How to Make Cue Cards
Highlighters
Card
Scissors

2. Before starting on the cue cards themselves make sure you've got the flow of the speech how you want it.
Using your speech outline go through from the beginning checking the sequence of ideas, supporting material and their transitions to ensure all your information is in an effective and logical sequence.
Do try it out loud and time it. You may need to edit if it's too long and it's a lot easier to do that at this stage.
Once you have the length right for your time allowance, if possible get other people to listen to you. Have them give you feedback on content, structure and delivery; paying particular attention to the introduction and the close. When you're satisfied you have your speech as you want it, you're ready to prepare it for cue cards.

3. have ONE main heading or idea per card
are written clearly using larger than usual font (so you can read them easily)
have plenty of white space around each word or phrase to help them stand out
use bullet points or numbers to itemize the supporting ideas under the main heading
are written on ONE side of the card only
are clearly numbered so that you know the order they come in and/or they may even be tied together. (Make a hole through the left corner and tie with a loop of string so that the cards can be flipped.)
are colour-coded to show your main idea, supporting ideas, examples and transitions or links.
have where props are to be shown. For example: Main Idea One - Supporting Idea - Example - Show slide 1
have approximate timings marked so you can track yourself through your allotted time. If you find you're going over you can adjust by leaving out an extra example or conversely if you're under time, you can add one in.