Kick the baby's right, though I don't see anything wrong with adding notes in between or out of the 1st, 3rd, and 5ths. A good way to start would be to work with a basic triadic chord structure like

|-----------------------|
|-----------------------|
|-----------------------|
|------------4----------|
|---------5-------------|
|------7----------------|

To get the concept down it its good to work with a simple exercise (at least it worked for me), and a great picking exercise that also has a very demented sound to it is

|--4----------------4h5---3---------------3h4---|
|-----5-----------5----------4----------4--------|
|--------6-----6----------------5----5-----------|
|-----------7----------------------6-------------|
|------------------------------------------------|
|------------------------------------------------|

This is also a great way to practice sweep picking. Hope this was of some help :D

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