Ok first things first. It is impossible to "spot reduce fat" What that means is that you can't have awesome looking abs and be overweight on your arms, legs, etc. When reducing body fat (which is what people generally what people want when they say they want to "lose weight") you reduce your body fat from all over the entire body not just in one area. This said if you have a lot of fat over your tummy you can do crunches until you pass out everyday but you won't be able to see your tight abs b/c they are under the layer of fat on your tummy. However your abs would be kickin' underneath
Now I have no idea what your body composition is but I thought I should mention the above first. When I have my clients/patients ask about abs I always tell them that first b/c if they are trying to reduce their body fat on their tummies that happens as a result of nutritional change and exercise assuming other variables aren't effecting their weight to begin with.
If you want to work on your abs you have several options. These maybe hard to explain seeing as how I can't really show you.
The first type of crunch is the regular crunch
Sit on the floor with your knees bent at an angle and back straight
Cross your arms over your chest or place your hands on the front of your thighs
While continuing to keep your knees bent, lower your back to the ground but stop before your back is completely on the ground
The entire time make sure your feet stay on the floor
Then raise back up to your starting position.
The Second type of crunch is called the reverse crunch
Lay down on your back with your knees bent over your chest so your legs are up in the air. Your knees are at a 45 degree angle.
You may want to place your hands under the small of your back for back stability.
Then straighten your legs and bring them down close to the floor but don't touch the floor
Then bring them back to the starting position.
These are really hard to describe in words so I hope you're not too confused and I'm sorry I don't have any pics.
As far as sets if you are starting at 0 (say you've never done a crunch in your life) I would say (for a guy) try and start around 10-15 repetitions and add on 2 every week. I don't know how old you are or how physically fit you are so this all varies according to those types of things.
I don't know anything about Winstrol. Supplementation is not really my area of interest although many Exercise Physiologist do research in that area. I do know a good bit of nutrition as it pertains to cardiac patients and healthy eating. My area is more in Cardiac/Pulmonary rehab, working with over weight kids and diabetics. I did do my graduate thesis for Gatorade so I can tell you anything you want to know about how carbohydrate, caffeine, or tyrosine supplementation affects performance.