How many watts and what temperature range your soldering station needs depends largely on your application and budget.
Basically, the power is of secondary importance for do-it-yourselfers, as only in the professional sector do you need to work with soldering stations over 100 watts. For hobby use, even lower wattages are often advantageous, as they consume less power. If you are particularly impatient and place a lot of value on reaching the operating temperature quickly or want to prevent a drop in heat at the soldering tip for accurate work, you can invest in a higher-quality soldering station with 80 to 100 watts. For most do-it-yourselfers, however, 60 to 70 watts should be perfectly adequate.
The temperature range of your soldering station is very important. However, the vast majority of soldering stations have a very wide temperature range of approx. 100 to 450°C anyway, with which all soft soldering work can be carried out.