This is called the Grand Prix attack and is a prepared opening against the Sicilian. It is not considered a real threat for black anymore at the highest levels but is still probably playable at our level. There are many good articles on the internet about it; I would suggest starting there. I will say that experts suggest playing Nc3 before f4 to prevent 2...d4. An example line would be 1. e4 c5 2. Nc3 Nc6 3.f4 g6 4.Nf3 Bb7 5. Bb5 Nd4 6.O-O Nxb5........
Opening help :P
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To anyone who is an opening geek (unlike myself) what is the best continuation for this opening