Yes, everybody has a few hundred bad pictures in them. Some people just get them out of the way sooner than others and some people sort of give up. Keep plugging away. The most common errors when taking close-up photos are:
outside the focusing range of the lens/camera - you're either too close or not close enough - check the manual for the distance ranges.
camera movement - if you don't have a tripod, brace your elbows on a table top or something . Brace the camera on something steady, a nearby pipe, a stack of books, a bag of rice, beans, etc. Also gently depress the shutter button - don't punch it down. Use the flash - this can cut down blur from camera/subject movement. A faster 'film' speed could help too, at the expense of resolution.
Post a couple of pictures anyway, and we can get an idea of what you are doing, right or wrong.
Besides you can always delete the really messed up ones :grin: