I don't think you can have your sharingan and cursed seal active before the start of a battle, I think you have to do that when you reach your turn to reply.
As Shun see the uchiha advancing towards him, Shun quickly braced himself because he knew a battle that will go down in history will ensue between then. And as Sasuke got to mid-range away from Shun, Shun quickly creates an exact replica of himself made of smoke 2 metres to his left and the clone quickly releases several streams of mist from its wrist launcher which forms into a smoke dragon, linked to the wrist launcher that moves to envelop and suffocate Sasuke while at the same time, Shun quickly channels his earth chakra into the ground and uses it to cause an earth tremer at the earth below Sasuke to make Sasuke loose balance and fall to the ground as the dragon envelops him.
(Kemuri Bunshin no Jutsu) – Smoke Clone technique
Rank: C
Type: Supplementary
Range: short
Chakra cost: 15
Damage points: N/A
Description: The user makes a clone made out of smoke. When it is hit, it turns into a smoke similar to the smokescreen the user creates. The smoke clone is mostly used as a diversion tactic like other clone techniques.
Note: can only use smoke related jutsu.
Note: can only be used by Kigiri or Smoke users.
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(Enryū) Smoke Dragon
Type: Offensive
Rank: A-Rank
Range: Short-Long
Chakra: 30
Damage: 60
Description:
By unleashing a continuous stream of smoke from his wrist launcher, the user can use his chakra to shape the smoke into the form of a dragon linked to his wrist launcher. This gives him the advantage when facing enemies that specialize in close quarter, physical combat because the dragon is completely composed of smoke, making so that physical attacks are useless against it. He can form several Smoke Dragons at once, but in this case, each one proportionally smaller and weaker. Its primary battle ability is to envelop and suffocate the target. However, as smoke is dissolved when it comes into contact with water or wind this technique is weak against water and wind based attacks.
Note: Can only be used by Smoke bios
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(Doton: Yochi no Douyou) - Earth Release: World Shaking
Rank: C
Type: Offensive
Range: Short - Mid
Chakra cost: 15
Damage points: N/A
Description: The user will concentrate and release their chakra into the ground to create a small tremer that can result in making the enemies lose their footing and fall to ground or miss the aim of a given technique.