When playing warm ups, make sure you delegate 1 finger per note to ensure you are building finger strength and getting use to using all 4 fingers on your left hand. Start with a slow tempo (try 80bpm) and increase by 5bpm or so once you feel comfortable. If you need to gain strength on a particular finger, adjust the above exercise to suit your needs. The diagram below shows you how to stretch and build more strength with your little finger. (Play the order backwards from your high e to your low E afterwards)
below are some slightly trickier warm ups to help move around the neck and practice hammer on’s and pull offs.