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I am using an older camera nikon 5700 cool-pix.. to cheap to buy an other
I'd rather spend money on nice coins than a camera any day.

Although the 5mp resolution of your camera is a long way from the density of today's cameras, I think you should be able to get some enjoyable images.
The 5700 will focus as close as 3cm. However, at that close distance, lighting is a bit of a problem.
Try shooting from about a foot away from the coin. Try a little closer, if you can get good light on the subject. I've had some good results by placing a coin on a North facing window sill on a clear day.
Avoid zoom function, or add-on lenses. They just increase the chance of optical distortion.
Keep the camera steady!
Look for posts by SsuperDdave. He is our resident photo guru! (And guru of
Morgan dollars!)

Crop your images down to the coin.
Looking forward to seeing more pics from you!