Rollers

Getting the disc to roll is good fun and very useful for the course.

Roller Approach

Roller approach is usually thrown forehand as short range backhand rollers are very difficult to throw so that they land with the disc near enough to vertical.

Grip is the same as a forehand. Aim to put lots of flick and spin on the disc. Aim for a point on the ground you wish to pitch the disc.
A disc witha fairly sharp edge is best to provide a good rolling edge. I.e. Roc or driver rather than a putter.

The longer you fly the disc the more unpredictable the landing angle will be effecting accuracy.

The angle of the disc as it lands, wind direction, grass length, surface, up or downhill will all effect the direction of the roll.  Best to get out and practice and learn what you can do with a roller!
 

 

Roller Drives

On good surfaces rollers can be longer than thrown drives, also they can be used to get under and around obsticles.  
Backhand rollers with effectively roll with the opposite shape to backhand throw. I.e. Curve from right to left at high speed and then curve back to the right as it slows down.

Understable discs are best as they will hold the angle you throw them at until they hit the ground.  
Using a Champion Valkyrie is great for maximum distance; Stratus, Stingray and Meteor are also good options.

A sharp angle of run up from right to left across the teepad.
Bring the disc from a normal take back postion but held so that it is vertical with your hand above the disc.
Bring the arm over the shoulder really ripping the disc down aiming to hit the ground about 20 m away.
Rollers that attempt to fly further than this will rarely be controllable as the pitch angle isn't guarenteed.
Bets to practice on a footbal field or equivalent to experiment how different angles will affect the roll.