There are some designs that are going to come easier to you than others. I would pick 3 or 4 simple ones: meander, loops, e's and l's, tear drops, etc. Try all those, then concentrate your practice on the one you were most successful with. When you feel you've mastered that one, pick another. This way, you will start with a design that will be easiest for you and you can concentrate on the process. Have fun!