Once you've downloaded your ringtone file, you can use the iTunes music player to play at https://klingeltonkostenlos.de/soundeffekte/. This is a good way to test out the quality of the song before you actually make it your ringtone.
You can also use a mobile ringtone download website to save your favorite songs for later listening on your phone or other media device. A lot of these websites offer a free trial period, so you can try them out before you decide to buy.