*c3 knight has to move
Sicilian Defence Fischer-Sozin dilemna

if you are concerned about losing that pawn with such a huge positional advantage then you probably shouldnt play this opening. This line in particular requires that you are comfortable with material imbalance.

White has a good attack in this position. It's instructive to watch if you don't know it. 11.Bf4 is probably the best move in the position that fiveofswords posted but the most natural move to me was always 11.f3 because it sets up for tactics on the e-file. I'm not sure if this is theoretically good though.
There's also an instructive game between Tal and Fischer in this opening that also has some instructive attacking themes.

if you are concerned about losing that pawn with such a huge positional advantage then you probably shouldnt play this opening. This line in particular requires that you are comfortable with material imbalance.
Thank you for replying, perhaps you could show me some games with the line above where white takes advantage of his positional advantage over the lost pawn?
As fiveofswords said you shouldnt play something you are uncomfortable with. Maybe 7.a4 is a better line for you.
10 Re1 d5 11 Bf4 is indeed the way to go as far as i remember. :-)
1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bc4 e6 7.Bb3 b5 8.0-0 b4 after b4 my f6 knight has to move and black can capture my e4 pawn with his knight on c6.May I know what exactly must I do if he takes my pawn on e4? And where should I place my knight that was on c3 after being threatened by b4?