Sometimes it is difficult to know where to start in 3D printing.

Your printer may have come with a test model to print.

You may now want to start to download prints or look for something very small to print.

The attached model is simply a letter O.

On the Creality Hi printer, it prints in just over a minute.  Even with older printers the print is unlikely to exceed a few minutes.

The print takes about a quarter of a gram of filament to print. The amount of filament used is about 10 centimeters.  Somewhere around 4000 of these letter Os could be printed from a standard 1kg spool.

This is the smallest test print I would recommend starting with.  It prints quick, takes little filament, should be large enough to stick and be able to be removed from the print bed.

If your print doesn't stick to the bed, try loading this into the creality slicer and try adding a "brim" to the print.  There are also other products and methods to get prints to stick.