The schedule below may be of use. Everyone does play with each other at least once and at most twice, however there may be better schedules with a more balanced distribution of threesomes and foursomes. For example players 1 & 7 play more often in threesomes than the others, while player 10 only has one threesome.
Hope that helps.
( 9 10 13 12) ( 2 4 8 5) ( 3 1 14) ( 6 7 11)
(14 9 7 13) ( 2 6 1 10) (11 4 5) (12 3 8)
(13 5 10 12) (11 3 6 14) ( 8 7 1) ( 9 2 4)
(11 10 14 8) ( 3 9 5 6) ( 1 4 13) ( 7 12 2)
( 9 1 11 12) ( 4 10 3 7) ( 5 2 14) (13 6 8)
( 3 11 13 2) ( 4 6 12 14) ( 8 9 10) ( 5 7 1)