What Codger said. You are tryingto get a little orange glowing ember, typically the size of the tip of a ball point pen. Then slowly blow on it, and get the ember to grow bigger and hotter.
Also try other tinder, like the cotton balls with Petroleum Jelly.
Also, you need to use the right amount of pressure while scraping.
If you are doing light pressure, and quick, you may be getting spark, but not a good thick burst of spark. Don't be afraid to put a little ass into the striking pressure.
Get a flat piece of wood, 2x4, or 2x6, or plywood scrap, whatever.
Take some toilet paper lay it flat, hold sparker/flint/rod right over the TP and strike several times. You should see where the sparks have been hitting.
Use coarse sand paper or a file and make some wood dust. Try sparking into that.
Also you can try different types of metal for scraping along the Flint Rod.
Try a small edge of a file, or if you have a small round chainsaw sharpening file they work extremely well.
You will get it.