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Focus on the feeling of your lips against his, use your mouth sensually. It's not just kissing, it's basically making love with your mouth.
Your tongue isn't there to sword fight his, your tongue is there to taste him and feel the sensations of his lips and tongue.
If you understand that, then kissing is easy. There's no set way to do it. You just follow the mood.
But in general, start light like a feather. Don't over do the tongue, and enjoy it.