If you wish to learn working with the elements and using the elemental energy they obtain, one common way to do that is to meditate and try to feel yourself immersed in and filled with each one. If the element you wish to work with is fire, then meditate/relax, and then imagine yourself being filled with fire but not being harmed. Try to feel this strongly. 'Feeling' the physical sensation of each element with your whole body is the most important sensation here - it's not just mental visualization. Try to include smells and tastes (until you can almost smell and taste them mentally) as well as the usual mental imagery. In the case of fire, you might even pretend to inhale the fire into your body to get a good feel for it. Do this often until you can feel yourself filled with each energy type easily.
It is recommended that much time be spent meditating and balancing/purifying the self with each element. Once you are able to 'power up' with an energy, then you can begin to work with very basic methods of putting it to use. Example: If you wished to charge or purify an object or talisman with Water, you would 'power up' with or 'inhale' elemental water, and then 'exhale' or direct it at the object with the intention of either purifying or charging it with that energy type. This is the most basic method of utilizing elemental energy. Use your imagination for the rest.
Lets not forget that you need to know basic forms of energy manipulation before attempting to channel and manipulate elemental energy.