I play fingerstyle guitar and there are some usefull things to practice, such as: 24 Segovia scales ( 2 and 3 octave major and minor scales utilizing the rest stroke ), there are also several right hand studies, such as: Studio in A Major by Tarrega, Villos Lobos Study in E Minor and countless others.

I guess it depends on the style you play. If you like fingerstyle, I would suggest working hard on developing your right hand, or left hand if you are left handed.

I am also speaking mainly from the point of view if you are playing on a nylon string guitar. Then, nails become part of the discussion. So much to talk about! Keep on playing:)