The first step would be to set a metronome. Playing slowly and evenly is crucial when learning scales so start at a slow tempo ( ie 60pm) and move up incrementally from there. Running them thru the circle of 5ths will help you get used to the fingering of certain groups of scales. After that, you should break patterns. Depending on your level and how many octaves you are able to do scales, then there are a million different ways to practice them and have fun in the process. You could play different rhythms, ascend with one scale descend with another (ie C ascending, then Db descend, D ascend, Eb descend etc) contrary motion, the list goes on. Happy playing!