Analyzing the first jutsu:
The tech is good as it can be used for an all round attack, to force the opponent into a defensive position and to get a safe things (in mid air) from the target, the tech can be used to provide weapons for battle (though nothing special about the weapons), while in mid air the user get a good view of the terrain and can easily escape ground attack but the shortcomings of the tech make this move one done only in special moment like against an equal or slower or weakened opponent, I don't advice this as a starting move, it takes time to do and when against a faster opponent, they can disrupt the move halfway or destroy the scroll.
Format for the second jutsu.
Counter:
By producing a frontal defence like an elemental wall (earth or water wall) to counter the assault of the many kunais though this will temporary rob the user of his view so a better move will be the use of a wind jutsu that can see back the kunais to the user. This second counter will put the ninja at an advantage.
Advantages:
The technique has a wide range of attack, due to the number of Kunais it can not easily be dodged or avoided. It gets the job of many ninjas done at once saving up time and energy. Since the kunais levitate without the use of any physical medium, the user can find it easy to switch between moves if it should backfire.
Disadvantages:
The kunais all travel in one direction so simply moving from line of travel render the move useless, the kunais can not be called back and also the opponent can take the kunais as their weapon if they survive the attack which is not what we want. The weapons need the user directive to strike, this reduce the chance of a hit compared to an auto-target weapon.
Performing the third jutsu:
Alright!
Flex my muscle to shake off the training rust that have gathered over the months.
Pulling out a bomb tag I direct your clone to come pick it up and dash off from us, then I mold my chakra to resonate with the one in the paper bomb while your clone is still within long range from me I spike up my chakra to produce a rhythm which cause the bomb tag that your clone held to go off that is explode and destroy the clone.