The way I learnt how to play scales on one string was through licks like such..

Tab with fingering above.

''''''4''''''''''3''''''''2''''''''1''''''''4'''''''''3''''''''2'''''''1'''''''4'''''''3''''''''2'''''''1''''''''4'''''''3'''''''2'''''''1'''''''
E-12-0-10-0-8-0-7-0-10-0-8-0-7-0-5-0-8-0-7-0-5-0-3-0-7-0-5-0-3-0-2-0|
B------------------------------------------------------------------------|
g------------------------------------------------------------------------|



'''''1'''''''''2''''''3'''''''4'''''''1''''''''2'''''''3'''''''4'''''''1'''''''2''''''''3''''''''4''''''''''1'''''''2'''''''''3'''''''''4'''''''
e------------------------------------------------------------------------|
b-1-0-3-0-5-0-7-0-3-0-5-0-7-0-8-0-5-0-7-0-8-0-10-0-7-0-8-0-10-0-12-0|
g------------------------------------------------------------------------|

Just mess around with it find your own little licks and patterns Good luck. ;)

This may not be the best suggestion as I'm certainly no teacher.