Hi Soufiane.
I agree with you, there is a lot of information out there. However, a fact is that you can't get a flat belly or look ripped by just doing crunches or other single ab
exercises.
To get a flat belly, you need to lower your total
body fat percentage. The best way to do this in my opinion is a great
diet, strength
exercises and
cardio (I prefer and recommend
high intensity interval training instead of regular long, slow
cardio exercises, much more effective!)
Very good that you are joining a
gym. I recommend compound strength
exercises, meaning you target multiple muscle groups in the same exercise. And it's also very important to exercise your legs as well, as this is where you find the largest muscle groups in your
body. Muscle burns
fat and makes it easier to reach your
goal (don't worry about getting too big, girls never become very muscular unless eating A LOT or doing steroids etc)
Your biggest challenge is the
diet, and this is the most important one to reach your
goal. If you start eating healthy (chicken, turkey, tuna, eggs, salad, other vegetables, almonds, some fruit, low
fat cottage cheese, whole grain bread/rice) you should see great results!!
Was this understandable? Good luck!!