You won't be able to kill the gay belly unless you do cardio, as Lava said. Doing crunches will make your abs stronger, but they don't melt fat.
An excellent cardio exercise is HIIT (which stands for high intensity interval training). It's only 15-20 mins long (unlike your average jogging, which requires 45-60 mins), but it's a lot more intense.
Basically, since you are a beginner, do this:
Jogging casually for 5 mins, to warm up.
Then, do a full sprint (100%) for 30 secs, then jogging for 90 secs (to rest your body). Do this 30-90secs sprint-rest 6-8 times in a row, and then, this is a must, jog for 5mins to cool down your body.
Of course, if you can't do 6-8 sets, do as much as you can, and then build up from there.
Since it's so intense, don't do it more than 2-3 times in a week, and never day after day! At least one day between sessions is required, because your body takes up to 24-48 hrs to recover.
After this, week after week, you should intensify your training regime gradually. I highly recommend this, since I am doing it ('cause I've built me some fat on my hips), and it's really highly effective. Best time to do it is in the morning on empty stomach, or after work with weights. But it's not a must.
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edit:
I do about 30 classic cruch, next I do some only with legs. Some flexions
Better start this great program( <!-- m -->
http://www.twohundredsitups.com/<!-- m --> ), 30 crunches is weak. I do them as shown in the program for my "upper" abs, and this for my "lower" abs (it strengthens the legs too):
Also, I think you have started waaay too late for an "august beach look"
You should have started it like in April or something.