As there are already 26 Force traditions, it is easy to make one up. You just pick and chose 4-5 talents from the other traditions that fit the concept of your new tradition. If one of the talents that you want to use has a name associated with a different tradition, you just give it a new name and describe it as talent X. If you can't find a suitable talent there, look elsewhere in the game and adapt said talent for use with your tradition.
Let me give you an example:
The Bo Len Mu is a small sect that has established itself near the border to the unknown regions of space. They train in secrecy to understand the force through the betterment of the body and the mind. When they have received their training, they are free to stay on to train others or leave. However, they can never tell another of where they hide in the outer rim, and are bound to protect the sect if necessary. New recruits are chosen by those traveling the galaxy, and are brought to a trial in a remote location before being accepted for training.
Most Bo Len Mu will pick up a a telescoping metal Bo-staff (costing 265 credits), but even a sturdy wooden staff will do in a pich.
Talents
Bo Kata: Treat Bo (quarterstaff) as a Medium weapon not Large, can Pin & Trip with Bo-staff if Bo-staff in hand. Requires: Force Sensitive, proficient with Bo (quarterstaff)
Bo Apprentice: Bo-staff (quarterstaff) deals 1d8/1d8 damage and gain reach 1 if only one end of the staff is used for attacks.
Requires: Bo Kata, Rapid Strike
Bo Master: Bo-staff (quarterstaff) deals 1d10/1d10 damage and can benefit from the Improved Rapid Strike feat even though it is not a light weapon.
Requires: BAB +5, Bo Apprentice, Improved Rapid Strike
Fluidity: UtF for Acrobatics & can reroll UtF if can reroll Acrobatics, spend FP to be one size larger w/grapple
This is something I made up on the fly for you, so I can't tell if it is entirely balanced. I made it mostly so you could see that reusing talents is easy. Making up new ones is a bit harder and risk being unbalanced.