Any good advises about Kineticist?Depends on your Class.
In general, Stun Weapons are extremely powerful. Your Physique/Aim influences the chance of landing a Stun. If it's maxed, you should Stun most of the time.
Mercenary: Rough Leash or Custom Shock Gear. Personally, I think Stun is better than Trip. But the extra Shields from Draining can be useful.
Smuggler: Custom Shock Gear. Stun Weapons are especially good for Smugglers, because it triggers Aimed Shot/Sneak Attack.
Tech Specialist: Rough Leash or Custom Shock Gear. You could also go for a non-Electric damage Type (Glacial Auger, Knuckle Busters, Acid Lash*) because Charge Weapon, but I find regularly getting 2 rounds of free Shield Regen too valuable.
Warden Shield is probably the best Sidearm for a Melee Primary. Hirudo Devourer or NaN Deconstrutor are also an option for HP recovery.
*Malai, Dhaal.Heavy Slut Ray is good for all classes, because it has Stun. Mercs can fire it 4 times/round and Techs can Overcharge it.
Mercenary: Some people swear by Saurmorian Rail Gun, but Ice Cappers has the same expected damage (because Crits). More, if you increase your Crit Chance.
Smuggler: Shock Bow, Ice Lance* or Sunsetter.
Tech Specialist**: Lash Cannon or XT8-Peer.
For your Melee Slot, Rouser is a good choice. Trick Bracer, if you're a Smuggler over the 50% Evasion Cap.
*From Malai on Dhaal. Not on the Wiki yet. Stun Chance.
**I haven't played a Ranged Tech Specialist, though I keep meaning to.Mercenary: Ostensibly, you want to be stacking Bonus HP and Defense, but I prefer Sheilds, so see Tech Specialist. You could also use LUCK.
Smuggler: This is tricky. Passive Evasion caps at 50%, so you want to coordinate with your other equipment to hit 50% but not go over. Leopard Print Jumpsuit, Zaika-Style Gown are both good choices.
Tech Specialist: You want to stack Shields. Augment-Weave, Zaika-Style Gown and Chameleon Armor are good choices.
I recommend keeping a suit of Augment-Weave Armor, even if you don't intend to use it in combat. The double Soreness recovery makes training at the Ten Ton Gym or with Ramis a lot faster.
Keep in mind, you take 3% more damage for point of total Evasion below 0. Negating Evasion penalties is important.