Here is a link to a thread with various force users in NGS talking about the class and offering some good insight. Hopefully it will be of some help.
Other than basic class information you can choose to read there and below this point, make sure you make a custom food recipe that caters to your class. I run 7 light meats, 2 light fruits and 1 robust meat for extra potency, pp, and pp recovery. As Te/fo.
Unfortunately, I don't use techer for it's weapon at all, so I cannot really comment too much on the skill tree if you intend to use wand. I am also a Te/Fo but I primarily cast Techniques and run Techer as main class just to buff and heal others around me. 8 people doing 5% more damage and taking 10% less damage is yum, not to mention the pp regen. I think you have to have a minimum of 4 people to buff for Techer to be "optimal". So I mostly used Techer SP on Shifta/Deband and it's add-ons.(7) I also filled out the elemental weakness PB charge and stuck a point into awake yell. (18) and then grabbed resta field and barta blot.(20). On the Force Side, I put 10 points into pp recovery up. 1 point into pp conversion and another into conversion increase. (12) I slipped points into Slow landing charge, Technique Charge pp well up, killing pp gain.(15) and my last five points went into Zonde clad, Elemental bullet, Rod react advanced, Tricky capacitor, and Talis bloom revoke.(20) This allows me to use Talis for the main weapon boost since it's a Techer main weapon, and by multi weaponing it with a rod, I can take advantage of Rod guard for the extra dps/elemental build up/ zonde and barta build up and the lack of a solid defense action that talis doesn't have (in additional to it's slower casting speed.)
I cannot really comment on how I stack up to other forces but by no means do I feel useless in UQs/Combat zones. Especially when the other 7 players are typically fighters, gunners and rangers.