It depends on your level. Working directly with the elements is quite advanced. We have specific meditations on our website. I suggest you check them and familiarise yourself with them if you have mastered some meditations both in the beginner and intermediate section. In particular, it is my opinion that the following meditations are a requirement to be mastered, not just tried:
Beginning
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Directing Energy
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Energy Meditation
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How to Clean Your Aura
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Meditation for Protection
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Opening the Chakras
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Satanic Void Meditation
Intermediate
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The Aura and How to Use it
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Chakra Breathing
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Circulating Energy
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Preliminary Meditations for Invoking the Elements
After you have mastered those meditations, you'll be confident enough to start working with meditations in the advanced section. I suggest taking your time with the preliminary meditations for invoking the elements before jumping directly into it. This could means a few weeks to a few months.
If you have you not mastered all those meditations, you can instead do the
alternate nostril breathing exercise which balances your entire soul and is safe for non-advanced meditators. If for some reason you cannot do that exercise (i.e. sinus issues), you can just do the breathing exercise for opening the middle chakra, as suggested by HP Hooded Cobra, which you can find on
this page.